The emulator is a way to play console games on PC. It’s all on developer he release game for which platform. PC, PS3, PS4 or other is only platform for developer. If you are a PC user then PC is your gaming platform.
Like sony exclusive games can be played only on PlayStation consoles. Now you are the PC user and the Sony has released the game for PlayStation which you will have to buy a console to play. So, here emulator helps you to play consoles games on PC without buying any consoles. Here you can find PS1, PS2, PS3, PS4, Xbox, Xbox One, sega, media, Gameboy and others.