The most complete search would consist of results from all services. Likewise, there are dozens of different searching services for the Internet. Each has a different way of working and each might give you different results, even with the same search term. The more you use, the more complete your set of results. We have divided the different search services into ten categories.
Subject directories are good places to start looking for a new subject.
They are manually built, so are smaller than many search tools, but the human intervention usually means that the sites are indexed appropriately. Search engines are databases created by software programs, known as robots or spiders, which search the web indexing words found in web documents. The whole process is automated, so in your search you need to think of the words and their spelling that are likely to appear on any of these web pages that you are looking for. Metasearch sites allow the simultaneous search of multiple search engines and directories. Always bear in mind that it is not possible to use the most sophisticated search capabilities of each search tool from a metasearch engine.