Internet search engines are sites on the Web that are designed to help people find information stored on other sites. Google is a form of internet search engine. All forms of search engines preform three basic tasks:
- They search the Internet -- or select pieces of the Internet -- based on important words.
- They keep an index of the words they find, and where they find them.
- They allow users to look for words or combinations of words found in that index
To find information in Web pages, a search engine uses special software robots, called
spiders. Spiders build lists of the words found on Web sites.
Web crawling is the process
when a spider is building its lists. The spider will begin with a popular site, indexing the words on its pages and following every link found within the site. In this way, the spidering system quickly begins to travel, spreading out across the most used portions of the Web.
"Spiders" take a Web page's content and create key search words that enable online users to find pages they're looking for. |
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