New TV setup eARC-what is it, what does it do?

Setting up a new Samsung QN55Q60 TV. I did have the old Vizio TV connected to Xfinity box via HDMI cable and Firestick to another HDMI port. I plan to have the same on new Samsung plus add a soundbar, but I have questions:

  1. Do I need the HDMI cable between TV and Xfinity box, or can they communicate without?
  2. What is eARC? Should I use the eARC HDMI port to connect any specific device?

Thanks in advance!


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