What is a ROM header?

A ROM header is a small section of metadata at the beginning of a ROM file, typically used in video game emulation. It contains important information about the game, such as its title, publisher, release date, and checksum values, which help emulators identify and correctly load the ROM. Additionally, the header may specify the hardware requirements and memory mapping for the game, ensuring proper functioning on the emulator. This data is crucial for accurate emulation and compatibility with various systems.