Wireframing serves as a blueprint for web applications and websites, allowing designers and developers to visualize the structure, layout, and functionality of the interface before the actual design and coding begins. It illustrates the placement of elements such as navigation, buttons, images, and content areas. Wireframes can range from low-fidelity (simple sketches) to high-fidelity (interactive and more detailed). This process helps to streamline design iterations, gather feedback early, and reduce the risk of costly changes later in the development cycle.