The criteria by which traditional search engines sort their search result listings constantly changes. It is like a never-ending 'cat n’ mouse' game between the web designers, who try to outsmart the search engines, and the search engines, who keep revising their computer programs in an attempt to better sort through the relevant sites.

Basically, how things work is that the search engines have computer programs called "spiders." These spiders crawl around the Internet trying to find any and every website in existence. When they come across a new website, they scan the contents of the site’s web pages. Then these contents are run through their sorting computer software to figure out where your website will appear in their various listings (search results).