This book aims to provide the industrial upgrading and business scenario improved and boosted by 5G, as well as to forecast the typical industry application with a 6G vision. At the beginning of the book, it builds an overview of how 5G stimulates industrial transformation in the global digitalization wave, involving its commercial use, policy support, and application development around the world. Also it summarizes the main challenges of 5GtoB in large-scale replication from the perspective of methodology and deduce its development path and future form oriented to XtoB. The author demonstrates the typical applications of 5G in key industries based on a large number of practices and propose common capabilities and essential components for large-scale replication, and details the progress in the convergence of 5GtoB and industry standards. It presents the 6G vision and innovative ToB enabling technologies and describe key technologies, including semantic communication, on-purpose network, and cell-free ultra-massive cooperative MIMO. As conclusion, it forecasts the typical industry applications of 6G, such as metaverse, man-machine interaction, and hyper-connected future city.