The book "Theory and Calculation of Hydraulic Machines and Drives", written by a team of authors, is an important work for anyone interested in modern technologies in the field of hydraulics and mechanics. This publication will become an indispensable assistant for students, graduate students, engineers and specialists working in the field of design and operation of hydraulic systems. It examines in detail the basic principles of hydro-volumetric machines, their design features and calculation methods, which makes it relevant for both theorists and practitioners. The book covers a wide range of topics, ranging from hydraulics basics to complex calculations and design of hydro-volume drives. The authors pay special attention not only to theoretical aspects, but also to practical tasks, which allows the reader to better understand how to apply the knowledge gained in real conditions. The text presents numerous examples and tasks that will help to consolidate the studied material and develop the skills of calculations. One of the key topics of the book is the analysis of the operation of hydraulic machines, such as pumps and hydraulic motors, as well as their interaction with other elements of hydraulic systems. The authors explain in detail how to choose the right equipment depending on operating conditions and performance requirements. This makes the book especially useful for engineers involved in the design and optimization of hydraulic systems. The book will be of interest not only to specialists, but also to students of technical universities who study disciplines related to hydraulics and mechanics. It can serve as a tutorial for courses on hydraulic systems, as well as become the basis for independent study of the topic. Due to the available presentation language and clear structure, the material is easily digested, which makes the learning process more efficient. The style of the authors is clear and logical, which makes it easy to follow the course of thought and not get lost in complex technical terms. The team of authors includes experienced specialists and teachers, which guarantees the high quality and relevance of the information provided . Their previous work has also received recognition in academia, which adds additional value to this publication. The topics raised in the book are relevant not only for engineering practice, but also for research. With the constant development of technologies and increasing requirements for the efficiency and reliability of hydraulic systems, the knowledge presented in this book is becoming especially important. Readers will be able not only to master the basics of theory and calculation of hydro-volume machines, but also to delve into modern trends and innovations in this area. If you are looking for literature that will help you to understand the complex aspects of hydraulic systems, improve your design and calculation skills, or just want to expand your knowledge in this area, "Theory and calculation of hydraulic machines and drives" will be an excellent choice. This book will not only enrich your library, but also become a reliable source of information that you can use throughout your career.