Google has two crawlers, each with a different function, to assure that it's index of the web is both deep and up to date. Today's Search Illustrated shows the function of each of these content discovery utilities:

Graphic by Elliance, an eMarketing firm specializing in results-driven search engine marketing, web site design, and outbound eMarketing campaigns. The firm is the creator of the ennect online marketing toolkit.

Google, Search Engine, Crawl, Google Crawler, Organic Crawl, Bot, Google Fresh Bot, Google Deep Crawl Bot

Source:? SEL Blog