Pairing is a simple process that connects the two devices so they can communicate with each other. The most common type of pairing is between a phone and a Bluetooth headset, but you can also pair two phones, or a phone with another type of device like a car stereo.
When you pair two devices, you usually have to enter a PIN or code on one of the devices to confirm the connection. Once the devices are paired, they will usually connect automatically when they're in range of each other.
If you're having trouble pairing two devices, make sure that they're compatible with each other and that they're in range (usually within 30 feet). You may also need to restart your devices or delete any existing pairs and start from scratch.