Search Engine Directories

There are 2 types of search engines: Search Engine Spiders and Search Engine Directories. Each search engine uses unique criteria for "ranking" sites - this "ranking" determines their placement in the search engine results page (SERP). Spider-driven engines use robots to spider sites on the Internet. Robots "crawl" each site and "score" pages based on relevancy. Directories have humans that check the sites - rather than robots. Some engines score the index page while others score individual web pages.
The goal of search engine optimization (SEO) is to get higher rankings. This is done using a two-step process. The first is to use industry information that allows professional optimizers to understand what these robots are looking for. This is a complex process because a Web site's placement within a spider driven search engine is derived from hundreds of variables such as link popularity, click popularity, keyword density, Web site themes and more. The second way SEO professionals optimize sites is to eliminate/reduce on-site techniques that can impede the search engine spidering process.
Duplicate Content; Doorway Pages; Frames; Cloaking; Link Farms, could either block search engine spiders form crawling your site accurately or ultimately get your site penalized in certain engines and/or directories. Take these into serious consideration when designing and/or optimizing your website.

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