If not because of Radio Broadcasting Company, we would have not even heard of what is going on around the world. In fact, radio is the most practical and time-savvy mode for all humans especially now that we are in an industrialized society where everyone should utilize his time to do more meaningful work.
How does a radio program work? This is a question to those who are listening from a radio. A radio station is using a signal transmitter, electromagnetic waves of radio waves for radio stations, microphone and tools for transmitting signals to networks. When a speaker in a station speaks, they send voice data through the airwaves and the radio will pick up the electromagnetic waves and translate it into sound which is now the speech, music and any other data that a microphone receives only depending on the pattern of the microwave.
Now, in the air, there is a signal installed by a station and this signal should be be received by a transmitter and this transmitter will send it to the carrier signal. These signals are accumulated and is sent to an antenna that will receive what is in the signal carrying electromagnetic waves. This is now why the antenna of a radio station is built in the mountain or in an area where it can broadcast to people through as networks when am and fm are turned signals works. This is now why we can listen voices from a speaker that we buy.