In its ninth edition, this book continues to provide a comprehensive, accessible, and up-to-date introduction to the dynamic field of computer science using a breadth-first approach. This book presents an introductory survey of computer science. It explores the breadth of the subject while including enough depth to convey an honest appreciation for the topics involved. The new edition includes reorganization of some key material for enhanced clarity (Software Engineering and Artificial Intelligence chapters), new and expanded material on Security and Data Abstractions, more on ethics and different ethical theories in Chapter 0. Anyone interested in gaining a thorough introduction to Computer Science.