CDMA2000 is a third-generation (3G) mobile communication standard that uses code division multiple access technology. It allows multiple users to share the same frequency band by assigning unique codes to each user, improving the efficiency of the network. This technology supports voice, data, and multimedia services, making it suitable for various applications. Developed by Qualcomm, CDMA2000 includes several versions, such as 1xRTT, which offers basic data services, and EV-DO, which provides higher data rates for mobile internet access. It has been widely used in many countries, contributing to the growth of mobile telecommunications.