The World Wide Web (WWW) is a popular and interactive medium to disseminate information today. The web is huge, diverse, and dynamic and thus raises the scalability, multimedia data, and temporal issues respectively. Web mining is the data mining techniques that automatically discovers or extracts the information from web document. Web mining attempts to discover useful knowledge from the secondary data obtained from the interaction of the users with the web. In this paper to discuss the web usage mining which has become very critical for effective web site management, creating adaptive web sites, business and support service, personalization, network traffic flow analysis and so on.