QA Server and its advantages:- QA stands for Quality Assurance. QA server is used for testing software where all types of tests are performed/done to measuring the quality of the software/product. Software is installed from development server to QA server where testes are performed. Failures/Bugs found while testing on QA server are corrected/fixed in development server and then promoted to QA server. The main benefit of having a separate QA server is that a Dev environment keeps changing and it is difficult to maintain the state of the environment with multiple people working on it. Generally developers have many tools running on the their environment that could affect the QA results working on same environment. QA environments are more like production server than Dev environment which helps in ensuring that the functionality is valid.