The key differences between 4G and 5G mobile networks lie in speed, latency, and capacity. 5G networks offer significantly higher data transfer speeds, potentially reaching up to 10 Gbps, compared to 4G's maximum of about 1 Gbps. Additionally, 5G provides lower latency, reducing delays in communication, which is crucial for applications like gaming and autonomous vehicles. Furthermore, 5G can support a vastly larger number of connected devices simultaneously, enabling the growth of the Internet of Things (IoT).