Functional Testing Services helps to validate and verify the software application to meet the users’ requirements and expectations for better functionality. This quality assurance testing checks software component specifications under test to identify any mismatch and logs that as defect. Besides, any unexpected results are marked as bug. Thus the functional testing methodology needs best in the breed of test experts and best practices to provide comprehensive coverage of functional specifications. Also, it must be customized to fit with client’s environment for seamless integration. Functional testing can be conducted in various lifecycle models like waterfall, agile, or iterative, and it can perform either manual or automation way.