A Bluetooth dongle is a small device that connects to a computer or other electronic devices to enable wireless communication using Bluetooth technology. It typically plugs into a USB port and allows devices like smartphones, headphones, and printers to connect without the need for cables. This makes it easier to transfer files, stream audio, or use peripherals wirelessly. These dongles are especially useful for older devices that do not have built-in Bluetooth capabilities. By adding a Bluetooth dongle, users can enjoy the convenience of wireless connectivity, enhancing their experience with various devices such as laptops, tablets, and smart speakers.