This lecture covers the fundamentals and applications of self-healing materials, exploring concepts such as reversible bonding, chain reentanglement, and noncovalent healing mechanisms. It delves into various self-healing mechanisms, including intrinsic and extrinsic approaches, and discusses real-world case studies of self-healing ceramics, concrete, metals, and polymers. The lecture also highlights the potential of self-healing materials in different industries, such as aerospace, sports, and military, and emphasizes the importance of understanding material systems and damage magnitude for effective implementation.