An SMC file is a ROM image of a game cartridge for the Super Nintendo Entertainment System (SNES). It contains a complete copy of the game's data, allowing users to play SNES games on emulators on various platforms like computers and mobile devices. SMC files are essentially digital backups of physical SNES game cartridges. They are created by dumping the contents of the cartridge's ROM chip into a file. The SMC format is one of the most common formats for SNES ROMs, alongside other formats like .SFC and .FIG. While the SMC extension is widely recognized, it's important to note that the internal structure and data organization within the file are generally consistent across different SNES ROM formats. Emulators use the data within the SMC file to simulate the SNES hardware and run the game. The legality of using SMC files depends on local laws and whether the user owns the original game cartridge.