A mockup is a visual representation of a design or product, often used in fields like graphic design, web development, and product design. It helps designers and clients visualize how the final product will look before it is built or produced. Mockups can be created using software tools or by hand, and they can range from simple sketches to detailed digital images. Mockups serve as a valuable communication tool, allowing stakeholders to provide feedback and make adjustments early in the design process. This reduces the risk of costly changes later on and ensures that the final product aligns with the original vision and requirements.