Soft resets are usually conducted in an attempt to fix malfunctioning applications or because they're required for software installation.
Soft reset contrasts with hard reset, which removes all user data, settings and applications and returns a device to the same state it was in when it shipped from the factory.
1. The beggining of the process depends on unlocking your screen and holding down your power button.
2. After that, on your screen should appear this menu.
3. Now tap on the Reboot or Restart option.
4. And your phone will restart and should work faster and smoother after that.
Some times your phone is not responding due to some application or other problem, in this situation you can reboot your phone.
If you want to erase your all data from your phone then you should go with factory setting restore.
This option will erase your all data.