A search Engine uses a program (or “spider”) that crawls through all the pages it comes across. Words on all those pages are analyzes and stored. When a searcher queries the search engine, the engine applies an algorithm to determine relevancy, searches its databases, and returns those documents in which the words are found. Alta Vista is a search engine. A directory is compiled by human beings. The human “editor” review listings, determine what they are about, and list them in an appropriate category, along with what they believe. Open directory project is a directory.
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