Branding style guide

A branding style guide is a document that outlines the rules and guidelines for how a brand should be represented to ensure consistency across all platforms and materials. It typically includes specifications for the logo, color palette, typography, tone of voice, imagery, and other design elements to maintain a cohesive brand identity. Can you explain in detail what a branding style guide is, what it typically contains, and why it is important for businesses or organizations to have one?