Review of Information Retrieval models

A large number of information of all the domains are available online in the form of hyper text in web pages. Peoples from different disciplines are consulting different web sites to fetch information according to their need. It is very difficult to remember the names of the websites for a specific domain for which the user wants to search. So a search is a system which mines information from the world wide web and present it to the user according to its query. Information retrieval system(IRs) works for search engine arranges the web documents systematically and retrieves the result according to the user query. In this paper we discuss the widely used information retrieval models, their evaluation parameters and application