What is a Search Engine?

What is a Search Engine?

What is a Search Engine?

Definition
A search engine (also known as a search index) in its most basic definition, refers to a huge database of information about each individual website.

How do they work
Large search engines such as Google, own thousands of computers that use software known as spiders or robots (or sometime just called bots) to grab web pages and read the information storedin them.These bots don’t always grab all the information, but they do get a large amounts of it.

Once they have this information, search engines then use complex algorithms (formulas) to calculate exactly which page should be shown for which keywords in which order. To stop people abusing the search engines, the algorithms they use are always kept as a secret, and known only to a handful of people (usually the developers).

Difference between a search directory and search engine
The key difference between the two terms is that a search directory is a categorized collection of information about web sites, whereas a search engine contains information directly from web pages themselves.

The three most important search directories are:

Google
Yahoo Directory
Open Directory Project

Why are they important?
Well, both of these directories are very old, and since Google and other major search engines, use the above directories when calculating their search results, having your site listed in both of them could be extremely beneficial if you want to be seen in search pages for your chosen keywords.

Summary
Article Name
What is a Search Engine?
Description
A search engine (also known as a search index) in its most basic definition, refers to a huge database of information about each individual website.
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