With CarPlay or Siri Eyes Free, you can keep focused on the road by using Siri to make calls, send text messages, play music that’s on your iPhone, get directions, and use other iPhone features.
CarPlay (available in select cars) takes the things you want to do with your iPhone while driving and puts them on your car’s built-in display. CarPlay uses Siri, so you can control CarPlay with just your voice. See Get travel directions in Maps on iPhone