A search engine is website application that allows users to search for information on the world wide web.
Search engines are mainly accessed by their website address. When a user visits a search engine’s website address, they can input their search criteria (also known as a search query) so that the search engine may produce a list of website pages which contain information related to the search criteria.
e.g, a user may visit http://www.google.com and proceed to input the search criteria funny videos :

Now they can click on the search button –

And now you can view and visit web pages from various websites which contain related results:

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