The 5G is a result of a long development of mobile communications, with roots going back to the 1980s when the first-generation mobile communications networks began to be reality. This chapter summarizes some of the key standardization bodies and industry forums that influence 5G either directly or indirectly, as well as the ones dealing with Internet of Things (IoT) standardization paving the way for the IoT in the 5G era. It also presents an overview of key concepts discussed in this book. The book is designed for the technical personnel of operators, equipment manufacturers, and telecom students. It focuses especially on the security aspects as well as on the network planning and deployment of the forthcoming 5G. The book summarizes the 5G functionality with a special emphasis on the new security requirements. It discusses the security techniques and gives common-sense guidelines for planning, optimizing, and deploying the networks.