The 5G is the fifth generation of mobile networks and succeeds to 1G (in 79, which brought voice), 2G (in 91, added SMS), 3G (in 2000, which allowed the mobile web) and 4G (in 2010, which brought voice in 4G via VoLTE as well as the increase in speed of mobile Internet connections). The 5G has three economic interests: to relieve the mobile telecommunications networks that will reach saturation, to allow companies to optimize certain processes, through the automation and fluidity of tasks, to allow the development of new applications based on the new performance. How time flies! Not so long ago, the launch of 4G brought a real revolution in the way we use the smartphone. And now comes 5G, which may profoundly change the world we live in. How, when? This book will tell you everything. We will relate the Generalities, the advantages, the disadvantages and the stakes of the 5G.