This textbook provides a comprehensive introduction to 5G technology, exploring both the underlying principles and its wide-ranging applications. The book is designed for students, researchers, and professionals seeking to understand the key concepts, architecture, and features of 5G networks. It delves into the evolution of mobile communication systems, from 1G to 4G, and presents a detailed overview of the advancements that make 5G distinct. The text covers essential topics such as the 5G network architecture, key enabling technologies (including millimetre waves, small cells, massive MIMO, and beam forming), and the role of network slicing and virtualization. It explores the impact of 5G on various industries, including telecommunications, healthcare, automotive, and smart cities, providing real-world examples of applications and use cases. With clear explanations, illustrative diagrams, and practical case studies, the book not only addresses the theoretical foundations but also emphasizes the practical implications and challenges in the deployment of 5G technology. It is an essential resource for anyone seeking to gain a solid understanding of 5G's potential.