To maintain the efficiency and competitiveness of industrial products, it is important to rationalize manufacturing process with the aim to increase automation. Oftentimes this is achieved by the application of fluid systems, subdivided in hydraulik and pneumatic systems. With this book the author especially intends to introduce the reader in the principles of hydraulics. Reference is made on the book "Grundlagen der Hydraulik" published by the CARL HANSER-Verlag. This book is in the 7th-edition. The book presented here, offers the possibility to familiarize with the topic of hydraulic in a condensed manner by keeping the time effort limited. This particularly applies for students at universities and technical schools, but it is also a beneficial help for technicans in professional practice who want to refresh their skills in the field of hydraulics. The last chapter the reader will finds ten exercises with a detailed presentation of the solution approach by use of the "step by step"-method. Each step is commented to provide highest clarity of the solution approach.