There are a few types of 3DS ROMs:
To play 3DS ROMs, you'll need a 3DS emulator that can handle the console's unique architecture. Some popular 3DS emulators include: all 3ds roms
CIA (CTR Importable Archive) files are digital installation packages, similar to how an .exe installs a program on Windows or an .apk on Android. There are a few types of 3DS ROMs: