How Search Engines Work: Crawling, Indexing, and Ranking

In order to show up in search results, your content needs to first be visible to search engines. It’s arguably the most important piece of the SEO puzzle: If your site can’t be found, there’s no way you’ll ever show up in the SERPs (Search Engine Results Page).

How do search engines work?

Search engines have three primary functions:

  1. Crawl: Scour the Internet for content, looking over the code/content for each URL they find.
  2. Index: Store and organize the content found during the crawling process. Once a page is in the index, it’s in the running to be displayed as a result to relevant queries.
  3. Rank: Provide the pieces of content that will best answer a searcher’s query, which means that results are ordered by most relevant to least relevant.

What is search engine crawling?

Crawling is the discovery process