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crawl depth

Crawl depth is the extent to which a search engine indexes pages within a website. Most sites contain multiple pages, which in turn can contain subpages. The pages and subpages grow deeper in a manner similar to the way folders and subfolders (or directories and subdirectories) grow deeper in computer storage.

In general, the further down in the Web site hierarchy a particular page appears, the smaller the chance that it will appear with a high rank in a search engine results page (SERP). A Web site's home page has a crawl depth of 0 by default. Pages in the same site that are linked directly (with one click) from within the home page have a crawl depth of 1; pages that are linked directly from within crawl-depth-1 pages have a crawl depth of 2, and so on.

A crawler -- also known as a spider or bot -- is a program that visits websites and reads their pages and other information in order to create entries for a search engine index.

This was last updated in October 2012
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