TDMA (Time Division Multiple Access) is a channel access method that allows multiple users to share the same frequency channel by dividing the signal into different time slots. Each user transmits in a specific time slot, so multiple stations can share the same channel without interference. TDMA is used in most 2G cellular systems and allows efficient sharing of radio spectrum among mobile users in a cell. It allocates users to individual time slots to separate the signals and avoid collisions. However, TDMA requires close synchronization and experiences difficulties with handoffs between cells when time slots are fully occupied.