Reset Android Phone or Factory reset is a way to restore the software smartphone / Android tablet in the initial condition like new out of the factory, the same as the term Hard Reset on non-Android mobile devices. Factory reset in general can solve almost any problem that is caused by damage the software. Of course by doing a factory reset all data and applications stored on the internal memory will be erased.
In general, the Factory Reset can be done through the Settings menu (settings) -> Privacy (privacy) -> Factory Data reset (factory data reset). However there are times when we are in the condition of smartphones will not start or can not enter into the menu, then to perform a factory reset, to go through recovery mode.