All of the latest Raspberry Pi models have Bluetooth built in, giving users another medium by which they can connect their peripheral devices such as headphones, keyboard, mouse, etc. Ideally, Bluetooth devices should be easy to connect to your Raspberry Pi. The connection process usually involves making your peripheral device discoverable, and then selecting the devices from the Bluetooth list on your Raspberry Pi.
Newer Raspberry Pi models such as the Raspberry Pi 4 come with Bluetooth capabilities built in. To get started using Bluetooth on your Raspberry Pi, you will have to make sure that the service is enabled. This allows the device to utilize the Bluetooth hardware to connect to peripheral devices like mice, keyboards, and headphones. If you are not planning to use Bluetooth, then you may want to keep it disabled in order to minimize unnecessary overhead. In this tutorial, you will see how to enable or disable Bluetooth on the Raspberry Pi model 4.
Rfkill is an utility available in the vast majority of Linux distributions, and often installed by default. The utility allows us to list, enable or disable various types of wireless interfaces like WIFI or Bluetooth on Linux.