HF radio, or High Frequency radio, operates in the frequency range of 3 to 30 MHz. It is commonly used for long-distance communication, as HF signals can bounce off the ionosphere, allowing them to travel beyond the horizon. This makes HF radio popular for maritime, aviation, and amateur radio communications. HF radio systems can be used for voice, data, and even emergency communications. They are essential for connecting remote areas where other forms of communication may not be available. Many amateur radio operators enjoy using HF radio to communicate with others around the world, fostering global connections.