A mockup is a visual representation of a product or design, 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 can save time and resources by identifying potential issues before the actual development begins, ensuring that the final product meets expectations.