Aggregation-induced emission (AIE) stands for an intriguing phenomenon in which a series of non-emissive molecules in solutions are induced to emit strongly in the aggregate or solid state. Over the past 15 years, AIE has grown into a research field with high visibility and broad impact across both science and technology. Aggregation-Induced Emission: Materials and Applications summarizes the recent advances in AIE research, including fundamentals, mechanismstudies supported by modeling and experimental investigations, promising applications in the fields of energy, environment, and biology.