What do you need to connect a computer to a Bluetooth device?

To connect a computer to a Bluetooth device, a Bluetooth adapter is essential. This adapter can either be built into the computer or can be an external device that connects via USB. The Bluetooth adapter facilitates wireless communication between the computer and Bluetooth-enabled devices like keyboards, mice, headphones, or smartphones. Without this adapter, the computer would not be able to send or receive Bluetooth signals.

The other options, while they serve important functions, do not directly support Bluetooth connectivity. An Ethernet port is used for wired network connections and does not relate to Bluetooth. A Wi-Fi card is used for connecting to wireless networks, which is a different technology from Bluetooth. Lastly, a USB connection is not inherently capable of establishing Bluetooth communication unless it’s specifically a Bluetooth dongle. Therefore, the presence of a Bluetooth adapter is what enables the necessary connection to Bluetooth devices.