This book comprehensively explores the evolving relationship between artificial intelligence (AI) and cybersecurity, presenting AI as a powerful defense mechanism and a potential security target. It is structured into three sections: the foundations of AI in cybersecurity, AI-powered security solutions for systems like networks and IoT, and the security of AI itself, including adversarial threats and privacy concerns. By combining conceptual taxonomies, real-world examples, and technical insights, the book is a valuable resource for researchers and practitioners aiming to leverage AI safely and effectively in the face of complex and adaptive cyber threats.