How to play iPhone/iPod music in car?

Is there a specific device I would have to get to connect my iPhone/iPod to the car so I can play it

Usually just an auxiliary cord. This basically is a cord with two plugs on each end. They look just like the end of headphones that go into your iPhone. What you do is plug one into your iPod or iPhone and the other goes into the car, there should be a hole for it by the radio. And then you hit the AUX button. It would have helped if you said what kind of car you have, as it changes. But you can get this cord from target, Walmart, radio shack, or even where you bought your phone

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