These little bots most likely to your site and also "review it" in much the exact same means as a human does, entrusted to right, leading to bottom. What these robots locate they remind the "mothership," the internet search engine database. If Googlebot finds your website regarding kitties, it will report the website, its area (URL), its contents, etc. to Google's database where it is kept. When a person then does an explore Google for kittens, Google looks to its own data source for search results page. This is just what makes search engines so quickly. All the searches you do contact information already in the internet search engine's database, not from a new search of the entire internet.