Bug Tracking Tools or Defect Tracking System is a software application that keeps track of reported software bugs in software development projects. It is basically a process of logging and monitoring bugs or errors during software testing. Many bug tracking tools, such as those used by most open-source software projects, allows end-users to enter bug reports directly. A bug tracking tool is usually a necessary component of a professional software development infrastructure. The main benefit of bug tracking tool is to provide a clear centralized overview of development requests and their state. Bug and issue tracking systems are often implemented as a part of integrated project management systems.