What is eARC and how is it different from ARC?

What is eARC and how is it different from ARC?

ARC and eARC: The Audio Feature that Enhances Your Home Theater

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OREI eARC 4K 60Hz Audio Extractor Converter 18G HDMI

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ARC and eARC: The Audio Feature that Enhances Your Home Theater

4K HDMI ARC/eARC Audio Adapter Converter-BUNGPUNG

HDMI ARC (Audio Return Channel) and eARC explained - FlatpanelsHD

OREI HDA-934: Dual HDMI eARC HDMI Audio Extractor, Key Features:, HDMI 2.0b, and HDCP 2.2 compliant, Video resolution up to 4K@60Hz RGB/YCbCr 4:4:4,

4K HDMI Audio Extractor Switch With ARC/eARC and EDID management (HDA-934)