Bluetooth is close communication protocol where two items can pair wireless. If your car radio can do it, you pair your phone to the radio. Alexa is used by Amazon Prime members with a 1000s upon 1000s of free songs. Alexa is the AI app that lets you talk to Amazon. You click it and say Play Bob Dylan or play Lay Lady Lay, and it does. If Bluetoothed to your car radio under aux on the radio it plays through the car speakers.
Alexa is the name of the app.
Bluetooth is the protocol that allows your car to answer and dial out on your phone.
