The brain

[hassen1]

The brain of a search engine, like the human brain, is the most complex of its functions and components. The brain must have instinct, must know, and must learn in order to function properly. A search engine (and by search engine we mean the natural listings of the major engines) must also include these critical three components in order to survive.

[mini_0]

Unless the author of the Web document specifies the keywords for her document (this is possible by using meta tags), it's up to the search engine to determine them. Essentially, this means that search engines pull out and index words that appear to be significant. Since since engines are software programs, not rational human beings, they work according to rules established by their creators for what words are usually important in a broad range of documents. The title of a page, for example, usually gives useful information about the subject of the page .