Design visualization is a technique that uses images, animations, or diagrams to convey messages and clarify concepts for industries such as architecture and engineering. The document outlines a course, 'Design Viz Pro,' which covers essential processes in design visualization, including 3D design and lighting simulation, employing industry-standard tools like Autodesk 3ds Max and Adobe Photoshop. Career options in this field include roles such as modeling artist, lighting artist, and 3D visualizer.