Introduction -- 5G, a revolution in telecommunications -- The evolution of cellular technologies -- Digital modulation used in 4G/LTE -- Digital modulation used in 5G -- AAS - Advanced Antenna System - the MIMO, Massive MIMO and Beam-forming antennas -- The various architectures used in 1G, 2G, 3G, 4G and 5G networks -- The language spoken by the 4G/LTE system -- The language spoken by the 5G system -- The evolution of RAN - Radio Access Network -- Digital modulation in detail -- Computer Networks -- Artificial Intelligence and ML - Machine Learning -- Conclusion.