CDMA leverages a spread-spectrum technology where each user is assigned a unique code to spread the baseband data signal across a wider bandwidth. All users occupy the entire spectrum simultaneously, but are separated by their unique codes, which prevents interference. This is in contrast to TDMA, which assigns different time slots to each user, FDMA, which allocates distinct frequency bands to users, and OFDMA, which utilizes orthogonal frequency division to separate user data.