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Emulation is the process of simulating hardware from one machine to another, allowing the second machine run the hardware of the first machine.
Break it down now: Lets choose video games. Through the process of Emulation you can play Gameboy, Playstation, Sega, Nintendo, etc. games on you computer.
You can download Emulators. This is the software that allows your computer to play the games from said systems on your computer.
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