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These special programs work automatically to find documents or they are asked by a creator of a Web site to visit the site to be included in a database. The information in these databases is collected using a computer program (called a "spider" or a "robot") that scans the Internet and gathers information about individual documents. Search engines are really just massive databases in which information from Internet documents are stored. The sites collected are viewed by humans who make decisions about what subject categories the sites might fit into. Search directories try to impose some sense of order on the information they collect and you're more likely to find information relevant to your research topic, but they don't offer the massive amounts of information that you would find with a search engine. There's more information to choose from in a search engine, but it's more difficult to retrieve relevant information. Search engines collect information from Web sites and then, more or less, just dump that information into a database. Fortunately, there are tools available that will sort through the mass of information: search engines or search directories. Some authorities estimate the number of documents on the Internet to be in the range of 800 million. The vast amount of information available on the Internet can be dizzying. « previous of 10 next » Internet Search Services Loosely organizing the ’net
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