Disclaimer

                     Typically a search engine works by sending out a spider to fetch as many documents as possible. Another program, called an inducer, then reads these documents and creates an index based on the worlds contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally only meaningful results are returned for each query.
                        Search engines use automated software programs called spiders or bots to survey the web and build their databases. Web documents are derived by these programs and analyzed. Data collected from each web pages are then added to the search engine index. When you enter a query at a search engine site your input is checked against the search engines index of al the web pages it has analyzed. The best URL are then returned to you as hits. Ranked in order with the best results at the top.