SEO Interview Questions & Answers

SEO Interview Questions Answers - Digital Nidhi

If you’re looking for a new Job, must read these SEO Interview Questions & Answers to prepare yourself to grab a wonderful opportunity. Enjoy!

1. What is SEO?

SEO is Search Engine Optimization, an Online Marketing Technique that helps you to bring your website on Top in SERP [Search Engine Result Pages] for a particular keyword through non-paid results.

Primary Function of SEO is to drive ‘organic’, ‘natural’ or ‘unpaid’ relevant traffic to a site that converts into leads.

2. Why prefer SEO?

Today companies want more relevant traffic to your site and convert their business into International Business. Users trust Search Engines & having a presence in the top positions for the keywords the user is searching, increase the website’s Trust.

3. What is Search Engine?

Search Engine is a Software System i.e. designed to search relevant information on the World Wide Web through the keywords. Search Engine normally gives the answers to the questions entered by the Users.

4. Name of the popular Search Engines?

Name of Popular Search Engines is Google, Bing, Yahoo, Baidu,,, DuckDuckGo, WolframAlpha, InfoSpace, etc.

5. Who is the founder of Google?

The founder of Google is Larry Page & Sergey Brin.

6. When was Google founded?

Google was founded on September 4, 1998.

7. Who was the Owner of Bing?

Owner of the Bing is Microsoft.

8. When was Bing Founded?

Bing was founded on June 3, 2009.

9. How does Search Engine work?

When you search, thousands of results are there with helpful information. How Search Engines decides which results need to show on the top.

So, Search Engines have 3 main functions: Crawling, Indexing & Ranking.

  • Crawling: Crawling is an automated process through which spiders [crawlers] find new and updated content. Content can be web pages, videos, images, pdf, etc.
  • Indexing: When crawling has been done, Indexing starts. In this, indexer collects the data from the local server for website indexing to arrange the website in a sequence like all school-related website to school category, all eCommerce related website to eCommerce category, etc. After indexing, all the data store into the main Server.
  • Ranking: When a user searches something, search engine check their index for most relevant content and then according to that content, arrange the results in a way to resolve the user’s query. The arrangement of results is called Ranking.

10. What is the Google Algorithm?

Google Algorithm is a set of commands used to retrieve data from the search index and provide the best results in response to the search query.

11. What is Google Panda?

Google Panda was launched on Feb 24, 2011. The aim of Google Panda is to lower the rank of low-quality sites that uses duplicate content, keyword stuffing, user-generated spam, etc.

12. What is Google Penguin?

Google Penguin was launched on April 24, 2012, to monitor the backlinks of the websites. Google Penguin targeted those sites that have irrelevant or spammy links or keyword stuffing.

In other words, Google Penguin awarded those sites that used white hat SEO and blacklisted those sites that have spammy links.

13. What is Google Hummingbird?

Google Hummingbird was released on August 30, 2013. Hummingbird is designed to pay more focus on each word of a query in place of pay attention to the few words of a query.

14. What is Google Pigeon Update?

Google Pigeon Update was launched on July 24, 2014. It was designed to increase the ranking of local search results by providing more relevant and accurate local search results display in Google Maps.

15. What is Mobilegeddon?

Mobilegeddon was launched on April 21, 2015. It aims to give more attention to the websites that display well on mobile devices. You can use Google Mobile-Friendly Tool to test pages individually.

16. What is Google’s RankBrain Algorithm?

Google’s RankBrain Algorithm is the 3rd most important ranking signal launched on October 26, 2015. It’s Machine Learning (AI) algorithm which is used to understand the search queries and sort the search results.

17. How RankBrain Works?

RankBrain has two major tasks:

  • Understand Search Queries or Keywords
  • It analyzes how people interact with the results for user satisfaction.

18. What is AMP?

AMP [Accelerate Mobile Pages] is an Open Source Project developer by Google with Twitter to designed really fast mobile pages. These are super lightweight and fast loading HTML pages.

19. What is the World Wide Web?

World Wide Web or WWW is an information system where documents and other resources are formatted in HTML and accessed through the HTTP [Hyper-Text Transfer Protocol]. It was invented by Tim Berners-Lee in 1991.

20. What is Domain Name?

Domain Name is the address through which online users can access your website. Every domain name has a unique IP address. For example: In, digitalnidhi is the domain.

21. What was the first domain? was the first domain registered on March 15, 2019, by Symbolics, a Massachusetts Computer Company.

22. What is a domain extension?

Domain Extension is the notation found at the end of the web address to specify the internet category or country code.

Example: .com is used for commercial, .com is used for commercial, .edu is used for educational, .gov is used for government, .mil is used for military, .net is used for network, .biz is used for business, .in is used for India, etc.

23. What is a Web Server?

Web Server is a software that has an IP address and a domain name to display web pages in response to the user request.

24. What is Web Hosting?

Web Hosting is a service that provides space for your website so that online users can access your website around the world.

25. What is SERP?

SERP [Search Engine Result Pages] are the pages i.e. displayed in the respond of the user’s query by the search engine. SERP includes both Organic & Paid Results.

26. What is Natural or Organic Result?

Natural or Organic Results are the listing of most related web pages to the user’s query. It’s also known as free or unpaid results.

27. What is Paid Result?

Paid Results are the advertisements that display above the natural results. In Paid Results, website owners paid to the search engines to show their website on the top of the page for particular keywords.

28. What is Google Suggest or Autocomplete?

Google Suggest or Autocomplete is a function of the Google Search Engine to provides the best suggestions related to the query i.e. entered by the user into the search box.

Google Suggest or Autocomplete - Top SEO Interview Questions

29. What is Keyword?

Keyword refers to the words or phrases entered by the user over the search engines to get the specific results.

30. What is the Long Tail Keyword?

Long Tail Keyword is a search query i.e. more specific keyword phrase. It contains 4+ words.

31. What is Keyword Density?

Keyword Density is the percentage of times a keyword shows on the web page compared to the total word count.

32. What is the formula of Keyword Density?

Keyword Density = ( Nkr / Tkn ) * 100 where Nkr = No of times you repeated a particular word & Tkn = Total no of words

33. If a keyword consists of several words, what’s the formula of Keyword Density?

If keyword consist several words, Keyword Density = ( Nkr / ( Tkn – ( Nkr * ( Nwp – 1 ) ) ) ) * 100 where Nwp = Total no of words in keyword phrases.

34. What is KPI?

KPI is Keyword Proximity Index, refers to how close keywords are to one another or the distance between two keywords or phrases. For example:

35. What is Keyword Prominence?

Keyword Prominence refers to the prominent placement of phrases or keywords within the web page. Prominent placement occurs in the meta tags, page header, paragraph starting or sentence starting.

36. What is Keyword Frequency?

Keyword Frequency refers to the no of times a keyword or phrase shows on a single web page.

37. What is Keyword Stuffing?

Keyword Stuffing is an Unethical SEO technique where large no of keywords insert into the web page to obtain top ranking in SERP’s and drive more traffic.

Keyword Stuffing is used to drive traffic for fraud or malicious websites. So, search engines penalize those sites that implement keyword stuffing.

38. What is LSI Keywords?

LSI [Latent Semantic Indexing] Keywords are the keywords i.e. related to the main keyword that you enter into the search box.

39. How to Find LSI Keywords?

Suppose you’re searching about ‘Off-Page SEO’ so enter ‘Off-Page SEO’ into the search box. When the result appears, at the end of the page display “Searches related to …..”.

LSI Keywords - Important SEO Interview Questions

40. Name of Popular Keyword Research Tools?

Keyword Research Tools are Google Keyword Planner, Keywords Everywhere,, etc.

41. What are the types of SEO?

SEO is of 2 Types. On-Page SEO & Off-Page SEO.

42. What is On-Page SEO?

On-Page SEO refers to all the activities i.e. performed within the website to rank higher and get the most relevant traffic from the search engines. It includes meta tags, heading tag, alt tag, URL optimization, content optimization, canonical tag, etc.

43. What is Off-Page SEO?

Off-Page SEO refers to all the promotional activities like blog submission, pdf submission, blog commenting, social bookmarking, etc for quality link building to get higher ranking in SERP’s.

44. What is a Meta Tag?

Meta Tag describes the page content. Important Meta Tags are Title Tag, Meta Description, Meta Keywords & Viewport. Other Meta Tags are Social Meta Tag, Robot Tag, Language, Author, Copyright, Sight Verification, etc.

45. What is Title Tag?

Title Tag describes the page. Every page of a website has a unique Title Tag. It used in the header. Character limit of Title Tag is 60-70 chars including space.

46. What is the Meta Description?

Meta Description describes the page in more depth as a comparison to the Title tag. It’s also used in the header. The Meta Description length is up to 160 characters. On mobile devices, it’s up to 120 characters including space.

<meta-name=”description” content=”SEO Interview Questions and ….” />

47. What is Meta Keywords?

Meta Keywords refers to put all the keywords into the keyword tag i.e. used into the page & most relevant to the content. It’s also used in the header. The Meta Keywords length is up to 180 characters including space.

48. What is Viewport?

The viewport is the window where a web page can be view. Must use this tag for good mobile experience. In the Meta Tag, “width=device-width” tells the browser to fit the page according to the width of the device’s screen while “initial scale=1” tells the browser to make the page as wide as possible. It’s also used in the header.

49. What is Robot Tag?

Robot Tag is an HTML tag that tells Search Engines what to follow and what not to follow. If you don’t use Robot Tag, by default it accepts as an index, follow. It’s also used in the header.

50. What is Site Verification?

Site Verification is the process of confirming the ownership of the website. It’s done through search engines like Google or Bing. Site Verification is necessary because once you verified the site, you have access to the private data of Search Engines.

Google verify the site via Meta Tag, External file or by linking Google Analytics Account. Bing verify the site via Meta Tag or XML file.

51. What is a Canonical Tag?

Canonical Tag is a process of selecting the best URL of a web page that you want to display in search results. Canonical Tag is a way of resolving the problem of content duplication when multiple versions of the same page are available over the internet.

For Example, Search Engines may crawl this site using these following ways:


In the case of Human, all these URL’s are the same but for the crawlers, every URL is a unique page. To prevent this condition, use the Canonical Tag.

52. What is Heading Tag?

Heading Tag is used to separate the heading and subheading form the web page. There are 6 heading tags used in SEO. These are h1, h2, h3, h4 , h5 & h6.

53. What is Alt Text?

Alt [Alternative] Text is also called “alt tag”, “alt attributes”. Alt Text is an HTML attribute. Search Engines could not understand the images on the web. So Alt Text is used to describe the images for web crawlers.

54. What is the URL?

URL is Unifrom Resource Locator, specify the web address of a web page over the internet. URL consists of Internet Protocols, IP Address & Domain Name.

55. How to Optimize Website URL?

  • URL should be simple, accurate and relevant.
  • In URL, use hyphens to separate the words.
  • URL should be definitive & concise.
  • Always use lowercase letters because sometimes uppercase letters may cause duplicate problems.

56. What is Backlink?

Backlinks are those links that come from another website. In short, it helps the users to move from one website to another website. It is also known as “Incoming Links” or “Inbound Links”.

57. Why are Backlinks important in  SEO?

Backlinks are more valuable for SEO because it’s one of the top 5 ranking factors. Organic backlinks have a lot of value than others. Followed backlinks from popular, high ranking and trustworthy sites to your site are considered as foremost fascinating backlinks to earn.

58. What are Internal Links?

Internal Links are hyperlinks that go from one page of a domain to another page of the same domain. These links mostly used in the main navigation and to build information hierarchy of the same domain.

59. What is Inbound Link?

Inbound Links are those hyperlinks that come from another website to your site only. Inbound Link is also known as “Incoming Links” or Backlinks.

60. What is Outbound Link?

Outbound Link is also known as “Outgoing Links” or “External Links”. Outbound Link is a hyperlink i.e. used to send traffic to another website. For Example: If you provide links of other third-party web pages into your website, it would be the external links to your site.

61. What are the types of Outbound Link?

There are two types of Outbound Links:

  • Do-Follow Link
  • No-Follow Link

62. What is Do-Follow Link?

Do-Follow Link acts as Backlink. It allows Search Engines to follow and boost the SEO of the linked site by communicating trust and impacting organic rankings.

Example of Do-Follow Link:  “Google

63. What is No-Follow Link?

No-Follow Link is a link that will send users to another site if clicked on but tells crawlers or bots not to crawl, that’s why only human can follow these links.

No-Follow attributes are commonly applied by the webmaster or any paid links, user-generated content, or in comment sections of the website.

Example: “Google

64. What are the types of No-Follow Link?

There are 2 types of No-Follow Link:

  • Robot Meta Tag: It tells to crawlers or spiders not to follow the links showed on full page. Example:
  • Link Attribute: It tells the Search Engines not to count the link in terms of ranking pages. Example:

65. What is Link Baiting?

Link Baiting is providing more valuable and informational content into your website for your readers and other sites give your link or reference into their sites without asking you. Linkable content can be anything either a research paper, case study, guide or video.

66. What is Link Baiting Techniques?

Link Baiting Techniques are:

  • Guest Posting
  • Widgets
  • Contests
  • Infographics
  • Hosting Services
  • Interviews
  • Crowdsourcing
  • Testimonials
  • Controversial Content

67. What is Robots.txt?

Robots.txt is a text file created by webmasters to instruct search engine crawlers or bots what is and is not allowed to be crawled on your site. 

Example of robots.txt: Here are the few examples of robtos.txt file:

  • It tells web crawlers not to crawl any web page of including home page.

User-agent: *

Disallow: /

  • It tells web crawlers to crawl all the web pages of including home page.

User-agent: *


  • It tells only Google’s crawler not to crawl the specific directory of the site

User-agent: Googlebot

Disallow: /profiles/

  • It tells only Bing’s crawler not to crawl the specific path or page of the site

User-agent: Bingbot

Disallow: /

68. What is Sitemap?

A sitemap is a file that contains information about the pages, videos, or any other file related to your website and the relationship between them. Search Engines read the Sitemap more carefully to crawl and index your site more intelligently.

A sitemap tells the crawlers to update the websites and provide information about the type of content. For example, A sitemap of “Video Entry” includes the category, video running time, rating, etc. A sitemap of “Image Entry” can specify the image subject matter, type, and license.

69. What is XML Sitemap?

An XML sitemap acts as a roadmap of your web site that leads Search Engines to all your necessary pages. XML sitemaps are good for SEO, as they permit Search Engines to crawl your all essential website pages more effectively.  XML Sitemap is used for Search Engines because search engine bots understand XML only.

70. What are HTML Sitemaps?

HTML Sitemaps have anchor link of the complete structure of your website and link all the important pages. HTML Sitemaps are very useful for the human users as they help them to find a page on your website that they’re looking for.

71. What is HTTP Error 404?

HTTP Error 404 or Page Not Found is a type of HyperText Transfer Protocol [HTTP] Error that’ll occur when a web page or web URL is not found.

72. When 404 Error occur?

HTTP Error 404 occurs when:

  • The content or URL was either deleted or moved to another URL.
  • URL was typed into the browser incorrectly or linked incorrectly.
  • Website is not running or Internet connection is broken.
  • Entered domain name doesn’t exist.

73. What is 301?

HTTP 301 is a very impressive and useful code to redirect a Web URL of a web page or web domain to another web page or web domain permanently.

74. What is 302?

HTTP 302 is a very impressive and useful code to redirect a Web URL of a web page or web domain to another web page or web domain temporarily.

75. What is Anchor Text?

Anchor Text is the clickable text in a hyperlink. Generally, anchor text appears as blue and underline such as Digital Nidhi Home Page. Today many websites are using different colors and styles for this.

76. What are the Types of Anchor Text?

Types of  Anchor Text are:

  • Branded Anchor Text (Eg: ‘Microsoft’, ‘Google’, or ‘Apple’)
  • Targeted Anchor Text (Eg: ‘SEO Interview Questions’, ‘SEO Tutorial’ or ‘Advanced SEO Tutorial’)
  • Generic Anchor Text (Eg: ‘Shop Now’, ‘Check Out’ or ‘Buy 1 Get 2’)
  • Plain URL  Anchor Text or Naked Anchors (Eg: ‘’)
  • Image Anchors

77. What is Compound Anchor Text?

According to Semrush, Compound Anchor Text is potentially dangerous as it contains your brand name with additional text. For example: “Best Buy Mackbook Air” would be a compound anchor for

78. What is Dwell Time?

Dwell Time is the time that a user spends viewing a web page after clicking on SERP’s. Dwell time is the duration when a user clicks on the web page and when returns from that page or close that page.

79. What is Pogo Sticking?

Pogo Sticking is when users visit several search engine results to find a satisfactory answer to their search query.

For example, You enter “SEO Interview Question” in Search Engine and click on 1 result but it’s not what you were looking for. So you go back to the search engine results to find the result that you want. So its Pogo Sticking.

80. What is Bounce Rate?

Bounce Rate is the percentage of a particular website’s visitors who opens a single page of your site and instead of browsing your website or trigging any request, they exit your website.

81. What is Google Webmaster?

Google Webmaster is an SEO Tool provided by Google to monitor the online presence of the website. It helps SEO experts, Business owners, and developers to see crawl errors, crawl stats, total backlinks and malware with a simple click.

82. What is Google Analytics?

Google Analytics is the most effective analytics tools in  SEO offered by Google to track, monitor and analysis the website’s visitors activity.

83. How to check how many Pages of Websites are indexed?

There are two ways to check the total indexed pages of your websites. These are:

  • You can check using Index Status through the Google Webmaster Tool.
  • You can also check by typing site: domain name (example: into the Google Search Bar. It displays all the indexed pages of your website.

84. What is a Trust Score or Trust Rank?

Trust Score or Trust Rank measures the trusts of your website pages or domain based on the no of high-quality links. In other words, Search Engines gives up ranks to those sites whose content and links are trustworthy. But if your website’s Trust Score is low, it’ll be considered as invalid or can be blocked also.

Trust Rank in the backlinks report will show you the quality of source page, while Trust Rank in the referring Domains Report will show you the quality of source domain.

85. How to measure Trust Score?

To measure the Trust Score, you can check the Moz Trust developed by Moz. It’s a very closest to measure Trust Score. Moz Trust scales 1 to 10.

86. What is Authority Score?

Authority Score tells about the overall quality of a domain. Authority Score uses Page Score, Trust Score, and Domain Score to calculate. It tells not only the amount or quality of backlinks but the strength and popularity of the domain as well.

87. What is Domain Authority?

Domain Authority [DA] is a Key Performance Metrics developed by Moz which rates on a scale of 1 to 100. It shows how well your site will rank on SERP’s.

88. What is Page Authority or Page Rank?

Page Authority [PA] is developed by Moz which score range from 1 to 100. It shows how well a particular page will rank on SERP’s.

89. What are the popular Off-Page SEO Techniques?

Off-Page SEO Techniques are:

  • Social Bookmarking
  • Search Engine Submissions
  • Article Submission
  • Forum Posting
  • Guest Posting
  • Classified Ads
  • Business Listing
  • Business Review Submission
  • Social Networking
  • QA Submissions
  • PDF Submissions
  • Video Submissions

90. What is Social Bookmarking?

Social Bookmarking allows to manage, search and share bookmarks of your website pages. These bookmarks are easy to access publicly using tags. Social Bookmarking sites are used as intelligent search engines.

91. Name of few Social Bookmarking Sites?

Social Bookmarking Sites are Reddit, Pinterest,, Plurk, Stbookmarking, etc.

92.  What is Search Engine Submissions?

Search Engine Submission is an attempt to submit your websites into search engines. Sometimes search engines also ask contact information like name or email with website URL.

93. What is Article Submission or Blog Submission?

Article submission or Blog submission refers to submit articles or blogs related to your website or business to get relevant traffic. Article Submission or Blog Submission is one of the most important, effective and ranking booster off-page SEO strategy.

94. Name of few Article Submission Sites?

Article Submission Sites are HubPages, Sooper Articles, Seo Article Tool, etc.

95. What is Forum Posting?

Forum Posting is a way to generate quality links and the right traffic for your site. Always remind Forum posting is very good if you first focus on building relationships then move to build links. There are no of Forum Posting sites but select according to your niche.

96. What is Guest Posting or Guest Blogging?

Guest Posting is a type of article submission. Guest Posting refers to writing and posting the article into another website or blog i.e. related to your niche.

97. What are Classified Ads?

Classified Ads refers to online advertising. Classified ads are small ads that include Title, Description, Images, Contact Information, etc. It can be categorized into two types: Free Ads and Paid Ads. In free classified ads, there is a limit for ads. In paid ads, the limit of days is exceeded.

98. What is Business Listing?

Business Listing is a way to boost your search presence in search engines. Business Listing includes business details, location, category, contact information, etc.

99. What is Business Review Submission?

Business Review Submission is an ORM strategy that helps to gain more trust in search engines for business products and services. So, it also helps to get good ranking in SERP’s.


100. What is Social Networking?

Social Networking is a way to expand the connections using different Social Networking Sites as these sites help to bring people to talk and share ideas, photos, videos, etc.

101. Name of Few Social Networking Sites?

Popular Social Networking Sites are Facebook, Twitter, LinkedIn, Instagram, Tumblr, etc.

102. What is Question and Answer Submission?

Question and Answer Submission refers to answering the questions asked by the users on different Q&A Submission Sites.

103. Name of few QA Submission Sites?

QA Submission Sites are Quora, Yahoo Answers, Answers, etc.

104. What is HTTPS/ SSL Update?

HTTPS stands for HyperText Transfer Protocol Secure. It’ an internet communication protocol that secures the communication between the browser and the server.

HTTPS transfer the data in an encrypted format to secure the link. HTTPS encrypted the link using SSL (Secure Socket Layer) or TLS (Transport Layer Security). TLS is the new version of SSL.

105. What is a Google Penalty?

Google Penalty is a negative impact on your website. Google Penalty means a ranking of your targeted keywords are dropped or your site is no longer listed on search results. Remember that Google penalizes only those sites that don’t follow webmaster guidelines.what isdfdsfdsfddd

SEO Interview Questions & Answers

8 thoughts on “SEO Interview Questions & Answers

  1. Hi! I’m working as a Digital Marketing Executive. I want to get deep knowledge in Advance Digital Marketing. So Please give some guidelines.

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