What is Bluetooth?

Bluetooth is a configuration that is currently available on many mobile phones

To be specific, it is a wireless transmission protocol that can realize wireless transmission of data, pictures, etc. between two mobile phones with Bluetooth. In order to achieve maximum resource sharing and updating, it is similar to infrared, but infrared needs to be aligned, Bluetooth is not needed, and it can be transmitted as long as it is within a certain distance (usually 10 meters)