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Chapter 2. How Search Engines Work > Building the Organic Index

Building the Organic Index

So far, the spider has crawled the pages, and the search engine has analyzed the markup and text on each one. The next step is creating the search index, which is a specially designed database that the search engine uses to quickly find the matching pages in response to any search query.

A search engine “remembers” which words are on which pages by storing them in its search index. In its simplest form, a search index contains a record for every word, followed by a list of the pages that contain that word. So, when searching for the word “glaucoma” in Google, the Google search engine looks in its index for the record for glaucoma and retrieves the list of pages.


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