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Frequency Modulation, or FM, is a method of encoding information onto a carrier wave by varying the wave's frequency. This is different from Amplitude Modulation (AM), where the amplitude of the carrier wave is varied to encode information. FM offers better sound quality because it is less susceptible to noise and interference. In simple terms, FM makes the radio signal more robust by changing the frequency at which it is sent. This method is particularly useful in environments where there are a lot of electronic devices, as it ensures the signal remains clear. When you tune your radio to an FM station, you're actually matching the frequency of your receiver to the frequency at which the station is broadcasting.

The term 'megahertz' or MHz is a unit of frequency that is equal to one million hertz (Hz). In radio broadcasting, the frequency at which a station transmits is measured in MHz. To put this into perspective, 1 MHz means that the wave oscillates one million times per second. Radio waves in the FM band usually range from 88 MHz to 108 MHz. For instance, when we say a radio station, like FM 102.1, broadcasts at 102.1 MHz, it means the wave oscillates 102,100,000 times per second. Understanding MHz is essential for tuning into the correct station and ensuring a clear signal.

Radio broadcasting is the process of sending audio content to a wide audience via radio waves. These waves travel through the air and are received by radios in homes, cars, and other places.
There are two main types of radio broadcasting: FM (Frequency Modulation) and AM (Amplitude Modulation). FM broadcasting is preferred for music because of its high sound quality, whereas AM is often used for talk shows and news because it can cover longer distances.
When a radio station wants to broadcast, it needs a specific frequency (like 102.1 MHz) to avoid overlapping with other stations.
Tuning your radio to the specific frequency allows you to catch the signals sent by the station. The encoded information—whether it’s music, news, or talk shows—is then decoded by your radio and played as sound.