A game emulator is a software or hardware that allows you to play video games designed for a specific platform on a different platform. For example, you can use an emulator to play Nintendo Entertainment System (NES) games on your personal computer (PC).
Emulators are important because they allow you to play games that you would not otherwise be able to play. For example, if you do not have an NES console, you can still play NES games on your PC using an emulator. Emulators can also be used to play games that are no longer available for purchase. For example, if a game is out of print, you can still play it on your PC using an emulator.