Other Uses
One advantage to ROM images is the potential for ROM hacking. Amateur programmers and gaming enthusiasts have produced translations of foreign games, rewritten dialogue within a game, applied fixes to bugs that were present in the original game, as well as updating old sports games with modern rosters. Software that emulates a console can be improved with additional capabilities that the original system did not have, such as Spatial anti-aliasing, running in High Definition video resolutions, anisotropic filtering (texture sharpening), audio interpolation, save states, online multiplayer options or the incorporation of cheat cartridge functionality.
Read more about this topic: Video Game Console Emulator