This testing technique is about checking the level of strength that the product has. It tests the point of failure of the product under different loads. The test engineers will check the robustness, toughness, efficiency and other strengths-based elements of a software product to identify the points at which it might break and lose on these levels. Destructive testing is essential and contributes a lot to ensure the efficiency of the product. You would know the potential points of failure for the end product, and if you think it would be unacceptable to the end user, you can start working towards fixing it. Not having these details can lead to repeated changes that waste your time and resources. Negative testing, on the other hand, is the process that verifies that the product doesn’t fail if it gets an unexpected input. That is why it is also known as failure testing or error path testing. The purpose behind this testing technique is to strengthen its reliability factor and see how it reacts to invalid inputs. For example, how the system responds if someone puts eight characters in the required column instead of the required ten.   Though the idea of destructive and negative testing is to add perfection to the end product, their objectives are different. One tests the points or values that can break the system, while the other tests how the system responds to negative or invalid inputs.