RAN, or Radio Access Network, is a crucial part of mobile telecommunications. It connects individual devices, like smartphones, to the broader core network of a mobile operator. RAN handles the radio communication between the user's device and the network, enabling services like voice calls and internet access. RAN consists of various components, including base stations and antennas, which transmit and receive radio signals. It plays a vital role in determining the quality and speed of mobile services. With the evolution of technology, RAN has advanced from 2G to 5G, improving connectivity and user experience significantly.