CDMA stands for Code Division Multiple Access which is a channes access technology used in
radio and mobile communications. The main theme of multiple access technology is to send multiple channels in a single channel so that the bandwidth consumed is saved. In TDMA the signals are alotted based upon time, In FDMA the signals are alloted based upon frequency but in CDMA each signals are given a code which is known as PseudoRandom code and the signals are generated and decoded based upon that code. CDMA also follows spread spectrum signalling in which there is a single frequency and all channels are spreaded in the spectrum as a random code.
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