What is the deference between search engine& data base?
Search engine or search service is a software that searches the Internet for information. Database is an organized collection of information (data) of one or more specific areas (The New Penguin English Dictionary, London 2000).
More about the search engine and the database you can read in the english Wikipedia, a free Internet encyclopedia. The addresses of the sites are http://en.wikipedia.org/wiki/Search_engine
and http://en.wikipedia.org/wiki/Database .