ROM games refer to classic video games that were originally released for older consoles such as the Capcom Play System 1 (CPS1), Capcom Play System 2 (CPS2), Sega Genesis, and others. These games are often played on modern devices using emulators and ROMs, which are digital copies of the game's original cartridge. Retro ROM games are popular among gaming enthusiasts who enjoy nostalgia and appreciate the simplicity and charm of classic video games.