Web
search engines like Bing continually search the Internet
for new documents and add them to their database. The Web
is a very large information resource consisting of millions
and millions of documents, but many of these documents contain
information which you do not want e.g.
material written by
10 years olds (not much detail)
material written by people
who do not know what they are talking about (inaccurate)
advertisements (not
wanted)
personal home pages
(boring!)
academic research papers
(may be too detailed and obscure)