Here's what you should know about emulators, including why people use them, how they commonly work, and what kinds there are. These are all different types of emulators. Even Logic Pro X, the popular music recording app for Mac, lets you simulate the sound of a guitar amplifier within your computer.
Dolphin is an app that lets you play Nintendo GameCube and Wii games on your computer. Emulators can be an incredibly useful tool on your computer.