Digital Marketing: Search engine optimization (SEO) — How Search Engines Crawl, Index and Rank
How search engines discover pages, store them in an index and decide which results to show first.
Digital Marketing · 26 questions
Try 3 questions
1. In search engines, what is 'crawling'?
- Ordering pages by their popularity
- Bots following links to discover pages
- Storing page text in a database
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Answer: Bots following links to discover pages
Crawlers fetch a page, extract its links and queue those links, which is how engines find content they have never seen.
2. Which step comes after a page is crawled and before it can rank?
- Indexing its content for retrieval
- Submitting it to a web directory
- Buying an ad for its keywords
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Answer: Indexing its content for retrieval
Indexing parses and stores what the page is about; only indexed pages are candidates when someone searches.
3. Search engines answer queries in milliseconds using an inverted index. What does it map?
- Pages to the links they point to
- Words to the pages that contain them
- Users to their past searches
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Answer: Words to the pages that contain them
Like a book's index, it lets the engine jump straight to pages containing each query term instead of scanning the whole web.
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