The World Wide Web consists of tens of millions of documents published by individuals and organizations around the globe. Web sites are organized by subject. Most search engines are also searchable. But there are excellent alternatives. Magellan, for instance, is much smaller - but reviews every site that it puts in its directory.
Every directory offers different features.
Search Engines Search engines are for more serious searching. Search engines keep databases of millions and millions of sites - much larger than the directories. Twenty-four hours a day, software robots search the Web for new sites to add to the database. You can't look for information by subject in a database that large - the technology and human power to organize it simply doesn't exist. But by entering keywords, you can find what you are looking for.