   
Search engines are also know as search tools, web crawlers, and
spiders. They are huge data bases that go out and sift through the
Internet. No one looks at or evaluates the sites that are included in
search engine results. Search engines do not index the entire
Internet - there is a hidden Web with sites such as special collections,
data bases, and more that are being excluded.
There are three main parts to most search engines.
- A spider which crawls through the Internet
gathering information.
- A data base which contains the information the spider gathers.
- A search tool, which people use to search through the data base
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