Code Division Multiple Access (CDMA) is a communication technology that allows multiple users to share the same frequency channel simultaneously. It achieves this by assigning unique codes to each user, enabling their signals to be separated at the receiver's end. This method improves the efficiency of the available bandwidth and reduces interference. CDMA is widely used in mobile phone networks and satellite communications. It supports a large number of users while maintaining high-quality connections. By utilizing spread-spectrum technology, CDMA enhances security and reduces the likelihood of eavesdropping, making it a popular choice for various wireless applications.