FireWire 800 is a high-speed data transfer technology developed by Apple that allows devices to connect and communicate quickly. It offers a maximum data transfer rate of 800 megabits per second, making it suitable for tasks like video editing and transferring large files. This interface is commonly used with external hard drives, digital cameras, and other peripherals. FireWire 800 is backward compatible with its predecessor, FireWire 400, allowing users to connect older devices while benefiting from the increased speed of newer ones.