This book aims to address many new developments of DOBC in both theory and application aspects. During the past 30 years, DOBC has achieved successful applications in engineering due to its powerful abilities in compensating disturbances and uncertainties. In this book, the authors conclude the major research results in the field of DOBC in both theory contributions and practical engineering applications. The book provides guidance for those interested in theory and method research of DOBC, and engineers interested in disturbance estimation and compensation technique for practical engineering systems, such as flight control systems, motion control systems, and process control systems, etc.