Even the best searches cannot be considered exhaustive or accurate. Because it is so easy and inexpensive to publish on the web, you should critically examine the information you find. Finding good material is possible, but it requires thought, practice, and patience. There is a great deal of information available on the web. Search engines and subject indexes offer a means of finding the URLs of resources that interest you.
Users can visit a search engine site and enter keywords to query the index.
Web pages and other Internet resources that satisfy the query are identified and listed. Technically, search engines are databases that are automatically compiled by computer programs, known as robots or spiders, that go out over the Internet to discover and collect information on Internet resources. There are many search engines available to help you find web pages. No search engine indexes all 800 million pages. There are too many pages and new pages are added too frequently.