A "dummy model" is a simplified representation of a system or object used in various fields, such as engineering, design, and research. It helps visualize concepts, test ideas, or demonstrate functionality without the complexity of a fully developed version. Dummy models can be physical, like a scale model, or digital, like a computer simulation. In product development, dummy models are often used during the prototyping phase. They allow designers and engineers to assess the size, shape, and usability of a product before investing in more detailed and costly prototypes. This approach can save time and resources while refining the final design.