The best use of Google search engine, for several reasons, the most important: it helps greatly in obtaining research through Google Scholar, it is often fast, contains a huge amount of data and the possibilities of linking it to email or sharing and others are very high....
Search engines are programs that search documents for specified keywords and returns a list of the documents where the keywords were found.
A search engine is really a general class of programs, however, the term is often used to specifically describe systems like Google, Bing and Yahoo! Search that enable users to search for documents on the World Wide Web.