A cellular network consists of multiple base stations, each covering a specific area called a cell. This approach allows efficient use of limited frequency resources through frequency reuse. Cell size can vary based on user density and traffic. Frequency reuse involves dividing available frequencies into sets used in different cells, creating a cluster pattern. When users move between cells, the network performs handovers, and a location register tracks user positions. In CDMA systems, cells can share the same frequency, with users distinguished by unique codes, while maintaining the basic cellular network structure to manage interference.