Frequency mixing is a process used in electronics and telecommunications where two different frequencies are combined to create new frequencies. This is often achieved using a device called a mixer, which takes two input signals and produces output signals at frequencies that are the sum and difference of the original frequencies. This technique is essential in applications like radio broadcasting and signal processing. In radio communications, frequency mixing allows for the transmission and reception of signals over long distances. By mixing a carrier frequency with an audio signal, the audio can be transmitted efficiently. The resulting frequencies can then be filtered to isolate the desired signal, making it easier to transmit and receive information, such as music or voice, over the airwaves.