HDMI ARC (Audio Return Channel) is a feature that allows audio to be sent and received through a single HDMI cable. This means that you can connect a variety of devices, such as Blu-ray players, set-top boxes, and gaming consoles, to your TV, which will then channel all the audio outputs to the HDMI-ARC connected soundbar or home theatre system. HDMI-ARC is also capable of passing high-resolution audio, including formats like Dolby TrueHD and DTS HD Master Audio. Using HDMI-ARC, you can also control the volume of HDMI-ARC connected devices using your TV remote, which reduces the number of wires and remotes needed. To use HDMI ARC, you need a high-speed HDMI cable, which is usually included with smart TVs. You also need to connect the cable to the respective ends, insert one end of the cable into the HDMI ARC port of your Smart TV, and insert the other end of the cable to the desired HDMI-ARC enabled device.