Bluetooth modules are short-range communication devices that use the 802.15.1 Bluetooth protocol to wirelessly connect two devices. This protocol is designed to provide high-speed and low-power communication between two systems. It is used for connecting mobile phones to computer peripherals, such as headsets, keyboards, and mice. Bluetooth modules typically contain an integrated radio, a controller, and a software stack that implements the Bluetooth protocol. They are often used in the implementation of mesh networks, a wireless network of interconnected devices. they are becoming more popular due to its convenience and low power consumption.