Involves creating simplified, low-fidelity representations of a user interface to outline its structure and functionality. It starts with understanding user needs and business goals, followed by sketching initial concepts to explore layout ideas. These sketches are refined into detailed wireframes using tools like Sketch, Figma, or Adobe XD, focusing on the placement of elements such as navigation, content areas, and interactive features. Wireframes serve as a blueprint, allowing designers and stakeholders to review and iterate on the design, ensuring the layout is logical and user-friendly before moving to high-fidelity prototypes and final development.