eARC, or Enhanced Audio Return Channel, is a feature found in HDMI 2.1 that allows audio to be sent from a TV back to an audio system, such as a soundbar or AV receiver. This technology simplifies connections by enabling a single HDMI cable to handle both video and audio, improving the overall home theater experience. With eARC, users can enjoy high-quality audio formats like Dolby Atmos and DTS:X without needing additional cables. It also supports higher bandwidth, allowing for better sound quality and more advanced audio features, making it a valuable addition for anyone looking to enhance their home entertainment setup.