A 50m 4K HDMI to HDMI cable is a fiber optic, active optical cable (AOC) that uses optical signals to transmit high-resolution video (up to 4K at 60Hz) and audio over long distances with no signal loss or interference. These cables are flexible, lightweight, and resistant to EMI/RFI, making them suitable for running through walls and tight spaces to connect devices like gaming consoles, PCs, and projectors to 4K TVs and monitors.