A USB Bluetooth adapter is a small device that connects to a computer or other electronic devices via a USB port. It enables wireless communication between the device and other Bluetooth-enabled gadgets, such as headphones, keyboards, or smartphones. This allows users to transfer data or stream audio without the need for cables. These adapters are particularly useful for older computers that do not have built-in Bluetooth capabilities. By simply plugging in the adapter, users can easily connect to a variety of Bluetooth devices, enhancing their device's functionality and convenience.