The iAP2 Protocol (iPod Accessory Protocol 2) is a communication standard developed by Apple that enables secure and efficient data exchange between Apple devices, such as iPhones, and external accessories like car infotainment systems. Widely used in Apple CarPlay, iAP2 establishes trusted sessions to allow seamless integration, audio streaming, app control, and other interactive features between the device and the accessory. Its primary purpose is to ensure compatibility, security, and a smooth user experience when connecting Apple devices to third-party hardware.