Emulation
An emulator is a program that runs ROM’s. It acts like a gaming system for your computer. EXAMPLE: a Nintendo emulator (like NESticle) would open its type of files (NESticle files are .nes) the each file has the information from the cartridge so you can play the game.
Emulators
NESticle
(the emulator I use) can be found at The Official NEStical HomepageROM’s
Adams Emulation Page is the best place to get ROM’s
The best games to get are