Non-functional testing examines the system's non-functional requirements, which are characteristics or qualities of the system that the client has specifically requested. Performance, security, scalability, and usability are among them.
Functional testing is followed by non-functional testing. It examines aspects that are unrelated to the software's functional requirements. Non-functional testing assures that the programme is safe, scalable, and fast, and that it will not crash under excessive pressure.
