What is the AUX port used for in cars?

Related questions

1. Can you plug headphones into an AUX port?
2. Can you charge through aux?
3. What is an AUX cable?
4. Is aux in for headphones?
5. Is coaxial digital or analog?
6. Can you adapt RCA to HDMI?
7. What is aux short for?
8. How many wires can an AUX cord have?
9. Can I play music through USB in my car?
10. Do wireless headphones have worse sound quality?

Tags

1. #music
2. #jacks
3. #phones
4. #portable
5. #auxiliary
6. #typically
7. #outputs
8. #stereo
9. #headphone
10. #players