The process used to determine which web pages are displayed in search results. Each search engine uses a different algorithm to determine the results displayed. This is why it is impossible for a web page to have high ranking on all search engines for a specific keyword phrase. Doorway Page Cloaking Hiding a web pages code content from a user, and delivering other content, usually optimized, to a search engine spider. Directory A web site that contains a database of information from other web sites that users can query to find specific subjects.
Directories gather information manually.
They do not use search engine spiders to gather the information. They have actual human beings review each site submitted and determine if the site submitted should be included in its database. Yahoo, NBCi and Open Directory are examples of a directory. The text a user keys in their browser to access a web site. When a user requests the FQDN, DNS servers translate the name into the IP address.