What is RCA cable used for?

Related questions

1. Is there a difference between RCA audio and video cables?
2. Can video RCA cable be used for audio?
3. Are RCA and AV cables the same?
4. Is it better to connect Soundbar with HDMI or Optical?
5. Are RCA cables digital or analog?
6. Is there an adapter for optical audio to RCA?
7. What does LFE on a subwoofer mean?
8. Do I need a HDMI switch or splitter?
9. What does RCA audio output mean?
10. Can you connect digital audio to RCA?

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