Normally users would not be able to play these games and applications unless they were using the respective console.
For instance, an emulator can be designed to allow users the option to play NES, or SEGA games on a Mac, or even play PlayStation games on an iPod or iPhone. The rise to fame is simply attributed to the fact that they allow users the option to interact with another device they wouldn’t normally be able to. Emulators have become very popular across the board, meaning they have been ported for use on many varying device types.