A style guide is a document that provides guidelines and standards for the visual and written communication of a brand or organisation. It outlines the rules for using design elements such as logos, typography, colours, images and layout, as well as the tone and voice of the written content.

Style guides are used by designers, writers, marketers and other professionals to ensure consistency and coherence in all communication materials, both online and offline. They typically include examples of correct and incorrect usage, explanations of design principles and guidelines, and specifications for the use of design assets and brand elements. Style guides are important tools for maintaining brand consistency, establishing a strong brand identity, and ensuring that all communication materials effectively represent the organisation’s values, personality and messaging.