What is a search engine ?

Here I am going to define the Search engine with respect of two view as given below :

In the respect of visitor the Search engines enable to their visitors to enter a specific word or term,known as
keywords.Once submitted,all pages containing those keywords that can be found in the search engine's directory
are listed on the search engine result pages.
In the respect of website who wants listing to search engine a search engine is a website such as Google on
which people can search for other websites on the Internet.
Search engines do not include sites manually,but have an
automated "search engine spiders"that "crawls"the web
through links.If your website has just one link to it,it will eventually be found and indexed in a search engine.The
term "search engine"is often used generically to describe both crawler-based search
engines and human-powered directories.
There are two type of
Search Engine :

Crawler-Based Search Engines
Crawler-based search engines, such as Google,create their
listings automatically.They
"crawl"or "spider"the web, then people search through
what they have found.
If you change your web pages, crawler-based search engines
eventually find these changes, and that can affect how you are listed. Page titles, body copy and
other elements all play a role.
Human-Powered Directories A human-powered directory,
such as the Open Directory, depends on humans for its
listings.You submit a short description to the directory for
your entire site,or editors write one for sites they review.
A search looks for matches only
in the descriptions submitted.
Changing your web pages has no effect on your listing.
Things that are useful for improving a listing with a
search engine have nothing to do with improving a listing in a directory.The only exception is that a good site,with good
content, might be more likely to get reviewed for free than a poor site.

What is a search engine ?

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