A game emulator is software that allows one computer system to mimic the functions of another, enabling users to play video games designed for different platforms. For example, a Nintendo game emulator can let players enjoy classic Nintendo games on a PC or smartphone. Emulators work by replicating the hardware and software environment of the original gaming console, translating its instructions into a format that the host system can understand. This technology not only preserves older games but also provides access to titles that may no longer be available on their original platforms.