Search engines are the key to finding specific information on the vast expanse of the
World Wide Web. Without sophisticated search engines, it would be virtually impossible to locate anything on the Web without knowing a specific
URL. But do you know how search engines work? And do you know what makes some search engines more effective than others?
When people use the term search engine in relation to the Web, they are usually referring to the actual search forms that searches through databases of
HTML documents, initially gathered by a
robot.
source
5 search engines on the Internet
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