Time Division Multiple Access is a channel access method for shared medium networks. What this means is that it allows several users to share the same frequency channel by dividing the signal into different time slots.
This is widely used in 2G networks and is currently being replaced as mainstream method with CDMA ( Code Division Multiple Access).
TDMA is a type of time division multiplexing with special point that instead of having one transmitter and receiver pair, there and multiple transmitters.
Time division multiplexing
It is method of transmitting and receiving independent signals over a common path. This is accomplished with the usage of synchronised switches at the end of transmission lines. The signals that are passed appear in alternating pattern.
This is actually used for digital signals, but it can also be used for analog signals.