Search Engine.
The word "search engine" sounds very familiar among Internet users. And when we mention the word "search engin" , we will always think of google and yahoo. Actually, a search engine is an information system, and it is used for helping find information on a computer system such as the world wide web (www.). Finding information on the public web like google and yahoo is a good example. How we use a search engine is to type up the word or phrase from the title or topic we are looking for. After that, the system will get information from the databases on the public web and show a list of items which match the word or phrase we have just typed up.