Part 1: Core SEO Study Material
1. The Three Pillars of SEO
SEO is generally categorized into three main areas of focus:
- On-Page SEO: Focuses on the content and HTML source code of a page (Keywords, Meta tags, Content quality).
- Off-Page SEO: Focuses on external signals to build authority (Backlinks, Social media mentions, Brand building).
- Technical SEO: Focuses on the backend website and server optimizations that help search engine spiders crawl and index your site more effectively.
2. How Search Engines Work
Search engines process information in three primary steps:
- Crawling: Bots “read” the code and content of every URL they find.
- Indexing: The search engine organizes and stores the information found during the crawling process.
- Ranking: When a user searches, the engine provides the pieces of content that best answer the query, ranked by relevance and authority.
3. Key Concepts for 2026
- E-E-A-T: Experience, Expertise, Authoritativeness, and Trustworthiness. Google uses these to evaluate the quality of a page.
- SGE (Search Generative Experience): AI-generated results that appear at the top of many search results, requiring a focus on “informational” authority.
- Core Web Vitals: A set of specific factors that Google considers important in a webpage’s overall user experience (Speed, Responsiveness, and Visual Stability).
Part 2: 100 SEO Interview Questions & Answers
1. What is SEO?
Ans: Search Engine Optimization (SEO) is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
2. What are the three main types of SEO?
Ans: On-Page SEO, Off-Page SEO, and Technical SEO.
3. What is a “Keyword”?
Ans: Keywords are the words and phrases that users type into search engines to find information.
4. What is the difference between “Short-tail” and “Long-tail” keywords?
Ans: Short-tail keywords are broad (1–2 words) with high volume and competition. Long-tail keywords are specific (3+ words) with lower volume but higher conversion rates.
5. Define “Organic” search results.
Ans: These are the listings on a search engine results page that appear because of their relevance to the search terms, rather than being paid advertisements.
6. What is a “Backlink”?
Ans: A backlink is a link created when one website links to another. They are essential “votes” of authority.
7. What is “Domain Authority”?
Ans: It is a search engine ranking score developed by Moz that predicts how likely a website is to rank on search engine results pages (SERPs).
8. What is a “Title Tag”?
Ans: An HTML element that specifies the title of a web page, displayed on SERPs as the clickable headline for a given result.
9. What is a “Meta Description”?
Ans: A brief summary of a web page (usually around 155 characters) that appears under the title in search results.
10. What is “Alt Text”?
Ans: Text used within HTML code to describe the appearance and function of an image on a page, used by screen readers and search bots.
11. What is “Internal Linking”?
Ans: The practice of linking to other pages on the same website.
12. What is “External Linking”?
Ans: Linking to a different website from your own.
13. What is an “XML Sitemap”?
Ans: A file that lists a website’s important pages, making sure Google can find and crawl them all.
14. What is “Robots.txt”?
Ans: A text file webmasters create to instruct search engine bots how to crawl pages on their website.
15. What is “Canonical Tag”?
Ans: A way of telling search engines that a specific URL represents the master copy of a page to prevent duplicate content issues.
16. What is “Page Speed”?
Ans: The amount of time it takes for the content on a web page to load. It is a direct ranking factor.
17. What is “Mobile-First Indexing”?
Ans: This means Google predominantly uses the mobile version of the content for indexing and ranking.
18. What is “Bounce Rate”?
Ans: The percentage of visitors who enter the site and then leave rather than continuing to view other pages within the same site.
19. What is “Dwell Time”?
Ans: The amount of time a user spends on a webpage after clicking a link in a search result before returning to the SERPs.
20. What is “Keyword Stuffing”?
Ans: The unethical practice of loading a webpage with keywords in an attempt to manipulate search rankings.
21. What is “Black Hat SEO”?
Ans: Unethical techniques used to get higher search rankings that break search engine rules.
22. What is “White Hat SEO”?
Ans: Ethical SEO practices that follow search engine terms and conditions.
23. What is “Grey Hat SEO”?
Ans: A combination of White Hat and Black Hat SEO techniques.
24. What is “LSI Keywords”?
Ans: Latent Semantic Indexing keywords are terms and phrases related to your main keyword that help search engines understand context.
25. What is “Anchor Text”?
Ans: The visible, clickable text in a hyperlink.
26. What is “SERP”?
Ans: Search Engine Results Page.
27. What is “CTR” in SEO?
Ans: Click-Through Rate; the percentage of people who click on a search result after seeing it.
28. What is “Google Search Console”?
Ans: A free service offered by Google that helps you monitor, maintain, and troubleshoot your site’s presence in Google Search results.
29. What is “Google Analytics”?
Ans: A web analytics service that tracks and reports website traffic.
30. What is “Duplicate Content”?
Ans: Content that appears on the internet in more than one place (URL).
31. What is “Featured Snippet”?
Ans: A short summary of an answer to a search query, displayed at the top of Google’s search results.
32. What is “Schema Markup”?
Ans: A code (Structured Data) you put on your website to help search engines provide more informative results for users.
33. What is “Local SEO”?
Ans: The practice of optimizing a website to appear in local search results for businesses with physical locations.
34. What is “NAP” in Local SEO?
Ans: Name, Address, and Phone Number. Consistency across the web is crucial for local rankings.
35. What is “Google Business Profile”?
Ans: A tool for businesses to manage their online presence across Google, including Search and Maps.
36. What is “HTTPS”?
Ans: A secure version of the HTTP protocol. Sites with HTTPS are prioritized in rankings.
37. What is “Crawl Budget”?
Ans: The number of pages Googlebot crawls and indexes on a website within a given timeframe.
38. What is a “404 Error”?
Ans: A message that appears when a user attempts to follow a broken or dead link.
39. What is a “301 Redirect”?
Ans: A permanent redirect from one URL to another.
40. What is a “302 Redirect”?
Ans: A temporary redirect.
41. What is “Link Juice”?
Ans: A slang term for the equity or value passed from one page or site to another via hyperlinks.
42. What is “No-follow Link”?
Ans: A link that does not pass “link juice” or authority to the destination site (rel=”nofollow”).
43. What is “Do-follow Link”?
Ans: A standard link that passes authority and helps the destination site rank higher.
44. What is “Guest Posting”?
Ans: Writing content for another website to build relationships, exposure, and backlinks.
45. What is “Search Intent”?
Ans: The underlying goal a user has when typing a query into a search engine (Informational, Navigational, Transactional, or Commercial).
46. What is “E-E-A-T”?
Ans: Experience, Expertise, Authoritativeness, and Trustworthiness.
47. What are “Core Web Vitals”?
Ans: LCP (Largest Contentful Paint), FID/INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift).
48. What is “LCP”?
Ans: Largest Contentful Paint; it measures the time it takes for the largest image or text block on a page to load.
49. What is “CLS”?
Ans: Cumulative Layout Shift; it measures visual stability (how much elements jump around during loading).
50. What is “INP”?
Ans: Interaction to Next Paint; it measures a page’s overall responsiveness to user interactions.
51. What is “Semantic Search”?
Ans: A search technique that focuses on the meaning behind the search query rather than just keyword matching.
52. What is “RankBrain”?
Ans: An AI-based search algorithm by Google that helps process search results.
53. What is “Hummingbird”?
Ans: A major Google algorithm update focused on understanding the context of queries.
54. What is “Panda”?
Ans: A Google update aimed at reducing the rank of low-quality sites or “thin” content.
55. What is “Penguin”?
Ans: A Google update aimed at catching sites that use spammy link-building tactics.
56. What is “Knowledge Graph”?
Ans: A database used by Google to enhance its search results with semantic-search information gathered from a wide variety of sources.
57. What is “AMP”?
Ans: Accelerated Mobile Pages; an open-source framework designed to make mobile pages load faster.
58. What is “Keyword Difficulty”?
Ans: A metric that estimates how hard it will be to rank for a specific keyword in organic search.
59. What is “Search Volume”?
Ans: The average number of times a specific keyword is searched for in a month.
60. What is “Evergreen Content”?
Ans: Content that remains relevant and useful for a long period after its publication.
61. What is a “Content Audit”?
Ans: The process of evaluating existing content on a website to see what to keep, update, or delete.
62. What is “Breadcrumb Navigation”?
Ans: A secondary navigation scheme that reveals the user’s location in a website or Web application.
63. What is “H1 Tag”?
Ans: The primary heading for a page; there should typically only be one per page.
64. What is “H2, H3 Tag”?
Ans: Sub-headings used to structure content hierarchically.
65. What is “Thin Content”?
Ans: Content that has little or no value to the user (e.g., very short pages, duplicate content).
66. What is “Cloaking”?
Ans: A black hat technique where different content is shown to the search engine than to the user.
67. What is “Disavow Tool”?
Ans: A tool in Google Search Console that allows you to ask Google not to count certain low-quality backlinks.
68. What is “Social Signal”?
Ans: A webpage’s collective shares, likes, and overall social media visibility.
69. What is “Technical SEO Audit”?
Ans: A process to check the technical aspects of a website to identify issues that could hinder performance in search engines.
70. What is “JSON-LD”?
Ans: JavaScript Object Notation for Linked Data; the preferred format for implementing Schema markup.
71. What is “Open Graph Tag”?
Ans: Tags that allow you to control how your content looks when shared on social media like Facebook and LinkedIn.
72. What is “SGE” (Search Generative Experience)?
Ans: An AI-powered search result that provides summaries and answers directly on the search page.
73. What is “Voice Search Optimization”?
Ans: The process of optimizing pages to appear in results when users use voice commands.
74. What is “Zero-Click Search”?
Ans: A search query where the answer is provided on the result page, so the user doesn’t click on any link.
75. What is “Pillar Page”?
Ans: A high-level piece of content that provides a comprehensive overview of a topic and links to “cluster” content.
76. What is “Topic Cluster”?
Ans: A group of interlinked web pages built around a central pillar page to show authority on a subject.
77. What is “Link Profile”?
Ans: The makeup of all links pointing to your website (their quality, source, and anchor text).
78. What is “Toxic Link”?
Ans: A harmful link from a spammy or untrustworthy site that can penalize your rankings.
79. What is “Hreflang”?
Ans: An HTML attribute used to specify the language and geographical targeting of a webpage.
80. What is “Crawlability”?
Ans: The ability of a search engine bot to access and crawl through the content on a page.
81. What is “Indexability”?
Ans: The ability of a search engine to analyze a page and add it to its index.
82. What is “Lazy Loading”?
Ans: A technique that delays the loading of non-critical resources (like images) until they are needed.
83. What is “Minification”?
Ans: The process of removing unnecessary characters (like spaces and comments) from code to reduce file size and increase speed.
84. What is “CDN”?
Ans: Content Delivery Network; a system of distributed servers that deliver web content based on the user’s location to speed up delivery.
85. What is “Skyscraper Technique”?
Ans: An SEO strategy where you find popular content, create something even better, and then reach out to people to link to your version.
86. What is “Broken Link Building”?
Ans: Finding broken links on other sites and suggesting your own working link as a replacement.
87. What is “Keyword Cannibalization”?
Ans: When multiple pages on your website are ranking for the same keyword, causing them to compete against each other.
88. What is “YMYL”?
Ans: “Your Money or Your Life”; a category of pages (Health, Finance) that Google holds to higher quality standards.
89. What is “Information Gain”?
Ans: A concept where search engines reward content that provides new information not found in other top-ranking results.
90. What is a “Soft 404”?
Ans: When a page tells the user it doesn’t exist, but the server returns a 200 (Success) status code.
91. What is “Branded Keyword”?
Ans: A search query that includes your specific company or brand name.
92. What is “Direct Traffic”?
Ans: Visitors who arrive at your site by typing the URL into their browser.
93. What is “Referral Traffic”?
Ans: Visitors who arrive at your site by clicking a link on another website.
94. What is “Pagination”?
Ans: Dividing content into separate pages (like “Page 1, 2, 3”).
95. What is “User Experience” (UX) in SEO?
Ans: How easy and pleasant a website is to use; Google rewards sites with high-quality UX.
96. What is a “Niche Edit”?
Ans: Adding a link to an existing, already-indexed blog post on another site.
97. What is “PPC”?
Ans: Pay-Per-Click; a model of internet marketing where advertisers pay a fee each time one of their ads is clicked.
98. What is “Affiliate SEO”?
Ans: Optimizing a website to rank for keywords that generate sales and commissions via affiliate links.
99. What is “SERP Volatility”?
Ans: When search engine rankings change frequently and significantly, usually during an algorithm update.
100. Why is SEO a long-term strategy?
Ans: Because it takes time for search engines to crawl, index, and build trust in your site’s authority and content quality.