Digital technology shapes our daily lives, from smartphones to autonomous cars, and Human-Computer Interaction (HCI) focuses on understanding and enhancing how we interact with these systems. Human-Computer Interaction: The Basics provides a concise and accessible introduction to the foundational principles, practical applications, and contemporary challenges of this dynamic and diverse field. This book begins by exploring key topics such as understanding the human context in which systems are deployed, applying design and evaluation methods, and building and deploying human-focused software. Later chapters examine the social and ethical implications of digital technology and underlying theory and research, incorporating insights from psychological and social science perspectives. For those aiming to understand how the systems around them have been designed, or are seeking guidance to improve design processes, this book offers valuable insights to support the creation of better, more effective systems. An essential read for newcomers and first-year students, this book is ideal for those undertaking or considering courses related to HCI, including interaction design, user experience (UX) design, user interface design, and human-centered systems, as well as interdisciplinary fields like the digital humanities. It also offers insights and inspiration for more experienced readers.