Laser damage is the permanent alteration or degradation of a material's physical, chemical, or structural properties resulting from interaction with intense laser radiation. As a critical area of research, it investigates the fundamental mechanisms, thresholds, and influencing factors governing these radiation-induced changes in materials and optical components. This field is essential for predicting material performance, determining operational limits, and developing strategies for preventing or mitigating such effects, thereby ensuring the reliability and longevity of laser systems and their applications in science, industry, and technology.