Search engine is a web based tool or application that is used to search the information over the www.
- Primary Search Engines: Such search engines use web crawlers or spiders to traverse the web and scan websites for key words, phrases, to generate database of web pages having some indexing or classification. Example– Google and Alta
- Web directory: Web directories organize information into categories and subcategories or directories. We can search a web directory for all those entries that contain a particular set of keywords. Example:-Yahoo.
- Meta search engines: Such search engines pass your queries to many search engines and web directories and present summarized results to the users. Example- Dogpile, Infind, Metasearch.
Functions of the serach engine: