A connection on a car stereo that allows external audio devices to be plugged in, typically using a 3.5mm audio jack. This input enables users to play music from portable devices like MP3 players or smartphones through the car’s sound system, providing flexibility in audio source options.
http://www.wikidata.org/entity/Q39531, https://en.wikipedia.org/wiki/Bluetooth, https://www.google.com/search?kgmid=/m/017lm&hl=en