Final answer:
AM and FM are two methods of transmitting information in the radio frequency range, with AM using variations in amplitude and FM using variations in frequency.
Step-by-step explanation:
AM (amplitude modulation) and FM (frequency modulation) are two different methods of transmitting information in the radio frequency range. The main difference between AM and FM lies in how the information is encoded in the radio waves. In AM radio, the amplitude of the wave is varied to carry the information, while in FM radio, the frequency of the wave is varied.