The G64 file format is a disk image format primarily associated with the Commodore 64 (C64) home computer. It's used to store the contents of a 5.25-inch floppy disk as a single file on a modern computer. This allows users to archive, share, and emulate C64 software and data. G64 images are typically created using specialized software that reads the raw data from a physical floppy disk. The format preserves the original disk structure, including sector headers, interleave, and any copy protection schemes that might have been present. Emulators and other C64-related tools can then use these G64 files to recreate the original disk environment, allowing users to run C64 programs and access data as if they were using a real C64 and floppy drive. The G64 format is a popular way to preserve and distribute C64 software, games, and demos.