Brand guidelines are a set of rules that define how a brand should be presented to the public. They include specifications for the brand's logo, colors, fonts, and imagery, ensuring consistency across all marketing materials. This helps create a recognizable identity that resonates with the target audience. These guidelines also cover the tone of voice and messaging that should be used in communications. By following these rules, businesses like Coca-Cola or Nike can maintain a cohesive image, making it easier for customers to connect with their brand and understand their values.