A bugs report or defects report is a list of bugs found out by testers while testing a software product in testing phase under a testing environment. The test environment is created at development site similar to the actual environment in which the software is supposed to work or run in live situation at customer site. Environment built for testing is supposed to be an independent entity meant only for testing team to perform testing without any development changes happening on it.
Bugs or defects report is the most vital tool for developers to understand where the product that has been built by them is lacking its functionality or performance. Testers have to be very careful in studying business and customer requirements while building their test cases and test plan. The quality of test cases will clearly enhance the core performance and functionality of the product built.