Abstract
Information Retrieval (IR) is the technique of getting information from document repositories. It is the science of searching for documents for information within documents as well as that of searching relational databases. Query Expansion (QE) is one of the various aspects of Information Retrieval. Query Expansion is the process of reformulating a query which leads to the improvement in IR. In web search engine context, Query Expansion involves evaluating user’s input and expanding search query to match additional documents. The purpose of this project is to analyze different kinds of QE techniques which help improve Information Retrieval. In addition performance of various database tools, such as, MySQL and MS SQL Server 2008, in query expansion will be conducted. Performance factors considered are CPU cost and time.