A special technique for checking software quality at which the application or system functional is tested against the requirements and generating the desired outcome is called functional testing.
As iOS platform is very popular today, then for maintaining, it ie required a good reputation, the thorough and detailed checking of all aspects and peculiarities as of the product system, as of conditions of its usage.
Initial state testing is related to the checking of the software product performance. If this type of QC is performed properly, then one may discover up to 85% of performance problems with its help.
Frequently, people who do not relate to IT recognize software product testing as a unit process with certain steps and test requirements. But this is much more complicated.