What does 4k Pass Through mean on a soundbar?

Related questions

1. Do I need 4k pass through on soundbar?
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4. Does 1080p look bad on 4k?
5. What's better than a 4k TV?
6. What is the difference between full HD and Ultra HD 4k?
7. Do you need a 4k HDMI cable for 4k TV?
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Tags

1. #source
2. #unaffected
3. #through
4. #directly
5. #passed
6. #upscaling
7. #definition
8. #without
9. #player
10. #processing
11. #allows
12. #receiver
13. #video
14. #feature
15. #example
16. #content