An audio adapter is a device that allows different audio equipment to connect and communicate with each other. It can convert signals from one format to another, enabling devices like headphones, speakers, and microphones to work together. Common types include 3.5mm audio adapters, USB audio adapters, and Bluetooth audio adapters. These adapters are essential for ensuring compatibility between various audio devices. For example, a 3.5mm audio adapter can connect a standard headphone jack to a USB-C port on a smartphone. This versatility makes audio adapters useful for both personal and professional audio setups.