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There are millions of web pages on the web. To search a particular information by viewing each web page
                  in the ocean of web pages, one would have to spend a lifetime. It is quite challenging for someone to find
                  exactly what he/she is looking for without using a search engine.

























                  Some popular search engines and their URLs are:

                    Search Engine                URL                                   Related To

                   Google            https://www.google.com        It searches information based on keyboards.

                   Bing              https://www.bing.com          It searches information based on keywords.

                   DuckDuckGo        https://duckduckgo.com        It does not have search index and data of their own.

                                                                   It is a popular hierarchical index search that makes
                   Yahoo!            https://www.yahoo.com
                                                                   searching the web simple and fun.
                                                                   It is based on questions that a user ask and another
                   Ask               https://www.ask.com
                                                                   user give answers.

                   Internet Archive  https://archive.org           It helps the user to search the history of web pages.

                  To search for a web page for specific information using a search engine:

                  When a person wants to get a particular information but does not know the site’s URL, search engines
                  assist as a personal guide to search the required information on the Internet.

                  Category of Search Engines
                  Search engines can be categorised in two types:

                  1.  Directory based: A directory based search engine helps us to search information by selecting
                     categories of a subject matter. The directory separates subjects into general categories (such as music)
                     which are divided into sub categories (such as music-guitar-musical instrument suppliers). Once a
                     category is selected the directory displays a list of web sites that provide contents related to that
                     subject/ category. It is similar to card cataloging in a library.
                     Such types of search engines can quickly locate information as if the user is looking for an encyclopedia
                     or a card catalog in the library. Examples of some directory based search engines are www.looksmart.
                     com, www.yahoo.com, etc.


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