The book "Operating Systems", written by a team of authors, is a fascinating and deep immersion in the world of computer technology, which will be interesting for both beginners and experienced specialists. This work is not just a textbook, but a real guide to the complex but fascinating field that underlies all modern computing systems. In the first part of the book, the reader will get acquainted with the basics of operating systems, their architecture and principles of operation. The authors elaborate on key topics such as process management, memory, and file systems. They explain how operating systems interact with hardware and how multitasking and security are ensured. Each chapter is filled with practical examples, which allows the reader not only to learn theoretical knowledge, but also to see their application in real life. The book will be especially useful for students of technical specialties, as well as for anyone interested in programming, system administration and computer science. If you want to understand how your devices work, how they communicate and how to optimize their work, then this publication will become an indispensable assistant for you. In addition, it will be interesting for those who already work in the IT field and want to deepen their knowledge of modern operating systems, such as Windows, Linux and macOS. One of the key topics raised in the book is the security of operating systems. The authors examine in detail the threats faced by modern systems and methods of protection against them. In the context of constant cyber attacks and data leaks, this topic becomes especially relevant. Readers will be able to learn about modern approaches to security, such as encryption, authentication and access control. The style of the authors is distinguished by clarity and accessibility of presentation, which makes complex technical concepts understandable even for beginners. They use many illustrations and diagrams, which helps to visualize the material and facilitates its assimilation. This makes the book not only useful, but also enjoyable to read. In addition, the team of authors includes experts from various fields, which allows you to create a multifaceted and comprehensive view of operating systems. Each of them brings their own unique experience and knowledge, which makes the book especially valuable. Readers familiar with other works by authors, such as Andrew Tanenbaum's Modern Operating Systems or Unix. Programming and Administration by Stephen P. Bennett, will appreciate the high level of presentation and depth of analysis. The book “Operating Systems” will be an excellent addition to the library of anyone who wants to understand the basics of computer technology. It is suitable for students, teachers, system administrators and anyone who wants to expand their knowledge in the field of information technology. If you are looking for a quality source of information on how operating systems work, how to configure and protect them, then this publication is definitely worth reading. Do not miss the opportunity to immerse yourself in the world of operating systems and discover new horizons in the field of technology This book will not only enrich your knowledge, but also inspire further research and practical experiments in computer science.