This book explores cybersecurity in industrial and operational technology (OT) environments in depth, addressing the challenges, threats, and protection strategies in critical infrastructures. From identifying vulnerabilities to implementing advanced security models, it analyzes real cases of cyberattacks, key regulations, and emerging trends in the protection of industrial control systems. With a practical and strategic approach, it offers essential recommendations to strengthen the resilience of organizations to the growing cyber threats in an increasingly digitalized and interconnected world.