Log is used for to store Detailed list information of an application information such as system performance and user activities. It can be used for keeping track of computer use likes emergency recovery,and application improvement. Each software program that is capable of creating a Log has different methods of starting or stopping the Log creation. A software Log file can be found in the Microsoft Windows 2000 and Windows XP Event Viewer which have logs events, errors, and other information occurring in Microsoft Windows. In Log file Many web pages are including Computer logs files users access, any errors that occur. These logs help the owners of the web page keep track of popular sections of their web page.