C64 mode refers to a graphical and audio emulation setting that mimics the capabilities of the Commodore 64, a popular home computer from the 1980s. This mode allows modern devices to recreate the distinctive 8-bit graphics and sound that characterized games and applications on the C64, providing a nostalgic experience for users. In C64 mode, software can utilize the original VIC-II graphics chip and SID sound chip emulation, enabling the display of pixel art and chiptune music reminiscent of the era. This mode is often used in retro gaming, programming, and digital art to celebrate and preserve the legacy of the C64.