: since no one is
in charge of the Web as a whole
, there is a business opportunity
for anyone to create an index of its contents and an interface for
searching that index. Such interfaces are known as search engines.
Typically the user will type in a few words that relate to what
he or she is looking for and click a search button, at which point
the search engine will present a links to web pages which are,
hopefully, relevant to that search.
While some early indexes of the web were created by hand, modern
search engines rely on automated exploring, or "spidering," of
the web by specialized programs that behave somewhat like web browsers
but do not require a human operator.
As of this writing, Google
remains the most popular search engine by a large margin.
MSN Search is also a
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