Cellular networks are communication systems that use a series of interconnected cells to provide mobile phone coverage. Each cell is served by a base station, which connects to the wider network, allowing users to make calls, send texts, and access the internet. This structure enables efficient use of radio frequencies and supports many users simultaneously. The technology behind cellular networks has evolved over time, with different generations like 2G, 3G, 4G, and 5G offering improved speed and capacity. 5G networks, for example, provide faster data transfer rates and lower latency, enhancing the performance of mobile applications and services.