The 10th edition of the classic "Software Engineering" by Ian Sommerville has been updated and expanded with new content, such as the ongoing integration of agile software development methods, resilience engineering, systems engineering, systems of systems, and much more. The book provides a fundamental introduction to the complexity of software engineering in the first part. The second part focuses on the development of reliable, secure systems, discussing topics such as cybersecurity and resilient systems. The third part covers a wide range of topics that play an important role in software engineering today. The content ranges from reuse, component- and service-oriented development to systems of systems and real-time software engineering. The fourth part is dedicated to project and configuration management.