Alexa requires an internet connection. In your car, that means it has to use your phone's cellular data connection. Asking simple questions doesn't use a lot of data, but using Alexa to stream music can eat through your bandwidth quickly if you don't have an unlimited plan.
There are six main ways to get Alexa in a car, and each one has its own benefits and drawbacks. While Amazon Echo Auto is an option, that's just the tip of the iceberg.
Here are the six ways you can get Alexa in your car: