CarPlay  is for Apple’s in-car interface that enables a car’s built-in display to act as a controller and display for an iPhone. A CarPlay adapter could be a device or accessory that adds CarPlay functionality to a car that doesn’t already have it built-in.

These adapters typically connect to the car’s existing infotainment system, either wirelessly or via a physical connection like USB. Once connected, they allow users to access a range of iPhone features, including navigation, music, messaging, and voice control, all through the car’s display.