A Brand Book, also known as a Corporate Identity (CI), is a comprehensive guideline that defines the visual and verbal elements of a brand, ensuring consistent application across various platforms and formats. It plays a crucial role in establishing a cohesive brand identity following the final logo design, outlining rules for logo usage, color palettes, typography, imagery, and tone of voice. By providing clear instructions on how, when, and where to implement these elements, the brand book helps maintain brand integrity, supports effective marketing efforts, and enhances brand recognition and professionalism in the marketplace.