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Pattern Group D. Writing and Managing Co... > Remember That Search Engines Crawl a...

Remember That Search Engines Crawl and Index Web Sites

Search engines have such a vast and widespread index of the Internet (or an intranet) because half of their job is to crawl every page they can find and index every distinctive word. These programs, called crawlers or spiders, start from a list of a few sites, and go from link to link, opening pages and indexing the words on those pages. The other half of a search engine's job is to generate results for every search query, whether a query consists of one word or many.

Some search engines calculate relevance scores on the basis of the frequency of word occurrences in a page or site; others rank sites on the basis of their importance. Either way, the words and content on your site (see Figure D6.2) must match the keywords that searchers use when they type in the search form. And the results that search engines display depend on the words and content of your pages as well.


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