Android Auto is a telemetric standard developed by Google to allow mobile devices running the Android operating system (Lollipop and later) to be operated in automobiles through the dashboard’s head unit. The standard will offer drivers control over GPS mapping/navigation, music playback, SMS, telephony, and web search; both touch screen and button-controlled head unit displays will be supported, although hands-free operation through voice commands will be emphasized to ensure safe driving. Compatible apps include Google Maps, Google Play Music, MLB at Bat, Pandora Radio, Spottily, Songs, Stitchery, heart Radio, Joyride and TuneIn.Android Auto is part of the Open Automotive Alliance, which was announced on January 6, 2014, and is a joint effort with 28 automobile manufacturers and mobile tech supplier Vida.
The aim of Android Auto is to extend the functionality of an Android mobile device in an automobile to the dashboard’s head unit. In order to use the system, users must be running Lollipop on their mobile device and must own a vehicle supporting Android Auto.  The driver’s Android device connects to the vehicle via USB cable.  Rather than running its own operating system, the head unit will serve as an external display for the Android device, which runs all of the software, by presenting a car-specific user interface built into Lollipop.
Several functions are supported:
4-SMS composition and playback
With Android Auto, a driver’s mobile device will have access to several of the automobile’s sensors and inputs Wi-Wi-Fi, Bluetooth and GPS Wi-Fi, Bluetooth and GPS, Bluetooth and GPS.