The three parts of "Computer Science - Introduction" cover all the content of the complete Bachelor's degree in Computer Science. The individual parts are aligned with the topics of the respective semesters. Each part independently provides the fundamentals for the corresponding subjects. With its didactic structure and exercises, the book is tailored to Bachelor students. Its clear presentation and practical examples engage beginners at their current level of knowledge. The second part focuses on computer architecture, covering everything from Boolean algebra and digital logic to RISC architectures and the architecture of the Intel PC microprocessor family. Fundamental knowledge of operating systems is deepened through examples of Unix and Windows. Computer networks are explained based on various technologies and protocols.