How are side bands produced?

Sidebands are produced when a carrier signal is modulated, typically through amplitude modulation (AM) or frequency modulation (FM). In AM, variations in the amplitude of the carrier signal create additional frequency components above and below the carrier frequency, known as sidebands. In FM, changes in the frequency of the carrier induce sidebands at varying distances from the carrier frequency, depending on the modulation index. These sidebands contain the information being transmitted and are essential for demodulating the signal at the receiver.