This document discusses the development and challenges of 5G networks. It provides an overview of previous generations of wireless networks from 1G to 4G and their key features. 5G is expected to be standardized in 2020 and aims to provide higher data rates of up to 10Gbps compared to 4G, as well as ultra-low latency and high reliability. However, implementing a 5G network presents several challenges including developing technologies that support high data rates and network capacity while optimizing energy usage, addressing issues of interference for full duplex communication, improving security and privacy, and handling the exponentially increasing data volumes from mobile users and IoT devices. The document also outlines potential application areas of 5G like immersive entertainment, environmental monitoring,