The search software is really database managers that have been developed over the years. Before a database can be searched, it must be indexed. Once the database has been searched, the results must be returned to the user in a usable format. The functions and characteristics of the chosen tools or technology Given a search key on a particular subject, a search engine takes a matter of seconds to return the URL's of all or nearly all of the Web pages that are known to contain the search key. You can search by keyword, subject matter and more.
Different search includes different search mechanisms.
Narrow the scope of a query. Return records within a range of values. Allow users to use position searching. Natural query language. It allows users to enter a question or phrase that best describes the topic for which they are searching.