With the newly revised 6th edition of the well-known foundational work, device developers and project engineers will find answers to all important questions regarding hydraulics. The structure of this interdisciplinary reference work has been fundamentally changed. While the earlier chapters address fluid components, the following newly designed chapters focus on fluid systems. Notable innovations in design and materials characterize the component section, whereas the system section is increasingly defined by the mechatronic basic structure and the specifics of fluid energy actuators. In-depth discussions follow on the design of electro-hydraulic control circuits, energy efficiency of mobile and stationary machines, simulation of machine systems, as well as functional safety and environmental compatibility of machines and plants.