What do the three pins in an XLR cable represent?

Related questions

1. Are XLR microphone cables balanced?
2. Can you convert XLR to RCA?
3. Can RCA be balanced?
4. What are XLR outputs used for?
5. Is XLR a mono or stereo?
6. What is the difference between digital audio and analog audio?
7. Do XLR cables carry power?
8. Is XLR or RCA better?
9. What does XLR mean in audio?
10. What cable is used for XLR?

Tags

1. #ground
2. #audio
3. #signal
4. #metal
5. #connections
6. #shell
7. #connector
8. #outer
9. #balanced
10. #refer
11. #therefore
12. #needs