A 4D model is a representation that adds the dimension of time to traditional 3D models. While 3D models show an object’s shape and structure, 4D models illustrate how that object changes over time. This is particularly useful in fields like architecture, engineering, and animation, where understanding the evolution of a design or process is crucial. In practice, 4D models can be used to visualize construction projects, allowing stakeholders to see how a building will progress from start to finish. They can also simulate scenarios in virtual reality or augmented reality, enhancing the way we interact with and understand complex systems.