What is the Difference between a Search Engine and a Directory?
A search engine is a machine - or a robot. A human may program algorithms for a search engine, but humans have nothing to do with your site when the spider is visiting your site or when the engine is ranking your pages. Google.com is an example of a search engine.
For the most part, humans compile directories. Dmoz.org (Open Directory Project) is an example of a directory. When you submit your site to Dmoz, a human will review your site for consideration in the Dmoz directory of web sites.
A search engine has a very large database because it will store several pages of every web site it indexes. A directory will only store a link to the home page of each site and a description.
Search engines will take the description either from some of the sentences on the web page or from the description meta tag. A directory will take the description from your submission information.
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