They help you to create Ps4 like environment in other devices like Pc, Mac, Ios, etc. Ps4 emulators are software that can run in other devices rather than Ps4 and let’s user play games on those devices.
So, here’s an easy tutorial which will let you configure any gamepad or Joystick to play literally any game on your Mac OS X (MacBook Pro / iMac / Mac Mini) by emulating keypress. Mac OS X doesn’t support Xbox 360 (XInput) Controllers, while it does support Direct Input Gamepad & Joysticks PS4, PS2, PS3 very few games actually support them.