World Wide Web (WWW) is very popular and commonly used internet's information retrieval service. Now-a-days, commonly used task on internet is web search. The user gets variety of related information for their queries. To provide more relevant and effective results to user, Personalization technique is used. Personalized web search refer to search information that is tailored specifically to a person's interests by incorporating information about query provided. Two general types of approaches to personalizing search results are modifying user's query and re-ranking search results.