Database design is the academic discipline and methodological process for structuring data and defining relationships within a database system. It involves the systematic application of principles and techniques for organizing data requirements into a formal model. This field investigates the optimal representation and organization of data to ensure integrity, consistency, and efficient access, characterized by stages such as conceptual, logical, and physical modeling and the application of principles like normalization. Its significance lies in providing the foundational structure necessary for developing reliable, scalable, and performant information systems.