A model is a representation of an object, system, or concept, often used in various fields such as science, engineering, and art. Models can be physical, like a scale model of a building, or digital, like a 3D model created using software. They help in visualizing and understanding complex structures or ideas. In the context of design and development, models serve as prototypes that can be tested and refined before final production. This iterative process allows designers and engineers to identify potential issues and improve functionality, ultimately leading to better products and solutions.