No search engine can search the entire Internet at once. Estimates vary widely but most popular search engines only index a very small percentage of the information contained online, about 5% or less.
There are many search engines available on the Web. Because each returns different results for a search, it may be helpful to try more than one search engine when you are looking for information.
Search engines also come and go; many have been bought by larger companies (e.g., Yahoo!, Ask Jeeves Inc.) and incorporated into more popular search engines.
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