Frequency Division Multiple Access (FDMA) is a channel access method used in communication systems. It allows multiple users to share the same communication medium by assigning each user a unique frequency band. This way, users can transmit their signals simultaneously without interference, as each operates on a different frequency. In FDMA, the available bandwidth is divided into smaller frequency channels, which are allocated to different users. This technique is commonly used in technologies like analog mobile radio and satellite communication, ensuring efficient use of the available spectrum while maintaining clear communication for each user.