This chapter summarizes the main aspects of the 1G-5G, and describes the background of each one. The radio section of the ITU is the highest-level authority for defining the universal principles of 5G. The ITU is thus planning to produce a set of requirements for the official 5G-capable systems under the term IMT-2020. The chapter outlines examples of the Internet of Things (IoT) deployments and estimates current penetration and outlook for near future. First, an overview of updated standards is presented. The standards are defining the global cellular-based narrow-band IoT solutions while the more limited IoT connectivity solutions are provided by proprietary providers. Second, deployment examples are presented for low-power wide area IoT connectivity solutions. Vehicular communication system is a network that consists of vehicles and roadside units.These represent communicating nodes and they deliver information between each other. Typical data include safety warnings and traffic information.