what is the difference between hdmi arc and earc?

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UVOOI 8K HDMI ARC/eARC Cable for Soundbar 6.6FT, eARC HDMI 2.1 Cable, High Speed HDMI Cord 48Gbps 8K@60Hz, 4K@120Hz Dolby Atoms (HDCP 2.2&2.3, 3D, HDR10) for Sound bar, Roku TV, PS5

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