The Audio Return Channel (ARC) is a feature found in HDMI connections that simplifies audio transmission between devices. It allows audio signals to travel both ways along a single HDMI cable, meaning that a TV can send audio back to an external sound system, such as a soundbar or AV receiver, without needing a separate audio cable. ARC is particularly useful for setups where the TV is the main source of content, like streaming services or cable channels. By using ARC, users can enjoy high-quality sound from their external audio devices while reducing cable clutter and simplifying their home theater systems.