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(HDMI Audio Return Channel) Starting with HDMI Version 1.4, the ARC channel lets a TV function as a home theater hub. The surround sound audio from the TV, Blu-ray player and other sources connected to the TV is directed back out via the HDMI ARC port to an ARC-enabled soundbar or A/V receiver connected to a sound system.

Enhanced Audio Return Channel (eARC)
In 2017, HDMI 2.1 introduced eARC, which added support for high-end surround sound such as Dolby Atmos and DTS:X.eARC also supports variable refresh rate (VRR), quick media switching (QMS) and quick frame transport (QFT), all of which reduce or eliminate delay and latency. See HDMI versions.

HDTVs Have Built-In Sources
In the past, the A/V receiver was always the central switching component for all the sources connected to a TV (cable, Blu-ray, media server, etc.). However, smart TVs have multiple sources built in such as Netflix and Hulu, and CableCARDs eliminate the cable box all together. In addition, the TV might also receive over-the-air signals from a roof antenna. The smart TV has thus become a central hub, and ARC allows it to send the audio from its internal and connected sources back out to a high-quality sound system instead of the TV's internal speakers. See home theater, smart TV, CableCARD, HDMI 1.4, soundbar, home theater in a box and A/V receiver.

The ARC port is labeled "in," because it can also accept video from an A/V receiver while sending the audio back out.

The ARC port is labeled "in," because it can also accept video from an A/V receiver while sending the audio back out.
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References in periodicals archive ?
For connectivity, the soundbar boasts of 2 HDMI ports with 4K passthrough and one HDMI ARC port.
The soundbar has 3 4K HDR enabled HDMI pass-through ports and one HDMI ARC port.
It has HDMI ARC too, but I have a pair of speakers that support 3.5mm or RCA and I can't connect them to the TV, which is disappointing.
It has three HDMI ports with 4K HDR passthrough along with one HDMI ARC port, a host of traditional connectivity options and a wireless subwoofer.
It also has HDMI ARC (Audio Return Channel), however there is no HDMI input for passthrough which is a bummer.
There you have the Ethernet port, RF port, 3 HDMI ports (of which port 3 is for HDMI ARC), one USB port Optical audio port and the antenna port.
It has a bunch of connectivity options including HDMI ARC, AUX, Bluetooth, and USB.