When entering URL's be careful to enter them exactly as you find them. You will find that most URL's will contain only lowercase letters. In this guide every site listed will contain its full address. A search engine is an electronic dictionary that searches by keywords for information on the World Wide Web. Most browsers will provide access to several search engines automatically in addition to providing a listing of other search services available through that browser.
Catalogs are ideal for broad category searches of established sites.
For narrow, nitty-gritty searching of all Web sites, a search engine is your tool of choice. A search engine is based on an abstract of the contents of millions of Web sites. Some, like Infoseek, Alta Vista, and Excite cover the full text of many pages. Others are based on headers and page titles. There are several sites that can provide additional information on search engines.