CDMA explain

Code Division Multiple Access (CDMA) is a channel access method used by various radio communication technologies.
One of the concept in data communication is the idea of allowing several transmitters to send information simultaneously over a single communication channel. CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel. In this, each user is allocated a unique code sequence.
On the sender’s end, the data signal is encoded using the given unique code. The receiver decodes the signal according to the unique code and recovers the original data. By contrast, Time Division Multiple Access (TDMA) divides by access time, while Frequency Division Multiple Access (FDMA) divides it by frequency.