A search engine on the Internet is a coordinated set of programs that includes:
A spider (also called a "crawler" or a "bot") that goes to every page or representative pages on every Web site that wants to be searchable and reads it, using hypertext links on each page to discover and read a site's other pages.
A program that creates a huge index (sometimes called a "catalog") from the pages that have been read, then receives your search request, compares it to the entries in the index, and returns results to you.
Basically you use a search engine to help you find information on the Internet. This is one way to "Surf the Internet", by continually clicking on hyperlinks on a listing to go to another web page, that a search engine gives you based on your search criteria.
We will be discussing many features of search engines in today's lesson. Let's get starting by clicking on the links below.
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