Model design refers to the process of creating a structured representation of a system or concept. This involves defining the components, relationships, and behaviors that make up the model. For example, in software development, a data model might be designed to illustrate how different database tables interact with each other. A well-thought-out model helps in understanding complex systems and guides the development process. In fields like architecture or engineering, model design can also involve creating physical or digital prototypes. These models allow designers to visualize their ideas and test functionality before actual construction. By refining the model, designers can identify potential issues and improve the final product.