What does balanced XLR outputs mean?

Related questions

1. How important are RCA cables?
2. Are XLR cables always balanced?
3. How long can RCA audio cables be?
4. Is RCA and aux the same?
5. What does XLR balanced mean?
6. Is analog audio better than digital?
7. What is analogue audio output?
8. Do RCA cables make a difference?
9. Is analog recording better than digital?
10. What do XLR cables plug into?

Tags

1. #often
2. #polarity
3. #necessary
4. #common
5. #impedances
6. #output
7. #opposite
8. #balanced
9. #equal
10. #interface
11. #technically
12. #carry
13. #signals
14. #means