Stress Testing:

Stress testing is also a part of performance testing which is done to find out the max load that the application can handle during production operations. This kind of testing will be done in such a way that the gradual increase of load will be applied until system breaks down. The point where the application/system breaks down will be noted as the breaking point of the application.

Stress testing is alike Load testing but the only difference is in load testing we apply varying load with a gradual increase and observe the response times, throughput and other statistics just to know how the application is responding at peak loads in peak hours.

Where as stress testing aims at finding the breaking point of the application server/ web server / database server for a particular load. In stress testing we increase the load until the system breaks down. This is mainly useful to know the future statistics, i.e if in future the expected new customers for the application increases, then this calculated stress testing measures will help us to know if the application will work fine with the increase of new customers.