A web search engine has three basic components: a web crawler that browses websites in an automated way, storing information from websites in a database; a database containing huge amounts of web resources; and a search interface that allows users to search through the database and find information from the web. The first search engine was Archie, created in 1990, followed by other early search engines like Excite, Yahoo, and WebCrawler, with Google now being the most widely used search engine.

1. Web search engine
A.T.M PERERA
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2. What is a search engine?
 A web search engine is a software system that is
designed to search for information on world wide web.

3. There are three basic components of a
search engine as listed below.
1.Web crawler
2.Database
3.Search interface

4. Web crawler
 A web crawler is a program which browse the world wide
web in methodical, automated manner.
 It is also refer to as web spider.

5. Data base
 All the information on the web is store in a database.
 It consist of huge web resources.

6. Search interface
 This component is an interface between user and
search engine.
 It helps user to search through the database.

7. History of search engines
 First search engine is archie which was created by Alan
emtage in 1990.
 Excite , yahoo, WebCrawler are examples for search
engines which was created in early 90s.
 Google is most widely used search engine in present.

8. Archie search engine interface