A design manual is a comprehensive guide that outlines the standards, guidelines, and best practices for creating specific products or systems. It serves as a reference for designers, engineers, and other professionals, ensuring consistency and quality in design work. Design manuals can cover various topics, including graphic design, industrial design, and user experience. These manuals often include visual examples, templates, and detailed instructions to help users understand the design process. They may also address aspects like color theory, typography, and branding, making them essential tools for maintaining a cohesive and effective design approach across projects.