A Bluetooth adapter is a small device that enables computers, laptops, or other non-Bluetooth devices to connect wirelessly with Bluetooth-enabled gadgets like headphones, speakers, keyboards, and smartphones. It typically plugs into a USB port and allows the device to send and receive Bluetooth signals. Bluetooth adapters are useful for adding Bluetooth functionality to older devices or enhancing their connectivity range. They are commonly used to pair wireless accessories, transfer files, or connect to audio systems without the need for cables. These adapters provide an easy, cost-effective way to upgrade devices, making them more versatile and compatible with modern wireless technology.