HDMI ARC stands for High-Definition Multimedia Interface Audio Return Channel. It allows audio to travel both ways between a TV and an audio device, such as a soundbar or AV receiver. This means you can send audio from the TV back to the audio device using a single HDMI cable, simplifying your setup and reducing cable clutter. With HDMI ARC, you can enjoy high-quality sound from streaming services or built-in TV apps without needing extra cables. It also enables features like CEC (Consumer Electronics Control), allowing you to control multiple devices with one remote, enhancing your overall viewing experience.