The way it works is that you select one or more songs to act as seeds for a new station, and the algorithm automatically picks other songs that it thinks you will like. Pandora is an internet radio service that uses an ingenious algorithm to create custom stations that are personalized to your own tastes.
Depending on how your mobile data plan is structured, you may also have to take bandwidth and audio quality into consideration. The method you ultimately use to listen to Pandora in your car will depend on the hardware you’re working with and whether or not you want to spend any money. If you don't already have that (most cars don't, yet), you can buy aftermarket car radios that include Pandora, or you can even use a cell phone that you already carry around anyway to add Pandora to virtually any car stereo system. In fact, some cars now come with Pandora functionality baked right in. Whether you’re totally new to the world of internet radio, or you’ve been listening on your computer for years, getting Pandora on your car radio is surprisingly easy.
How to Listen to Pandora on Your Car Radio.