Fundamentals of Redox Biology is a comprehensive guide to understanding the complex roles of cellular redox systems in biological processes and human health. Exploring the regulation, physiological functions, and pathological implications of reactive oxygen species (ROS) and free radicals, this book serves as an essential resource for students and professionals in biochemistry and related fields. It delves into the fundamentals of redox signaling, the impact of antioxidants on homeostasis, and the intricate balance between oxidative stress and disease development, including conditions like cancer and neurological disorders. This foundational text is invaluable for advancing knowledge in redox biology. In addition to providing a historical perspective on redox biology, the book examines how ROS influence epigenetic regulation and mitochondrial function, particularly in immune responses to infections. It also integrates discussions on the role of redox systems across multiple disciplines, making it relevant to cell biology, molecular biology, immunology, and beyond. With its detailed exploration of both theoretical and applied aspects, the book positions itself as a pivotal resource for understanding the mechanisms underlying redox balance and its broad applications in life sciences.