The Brand Guideline Document is a full package containing all you need to effectively use your brand visually across all media to achieve a consistent voice for your business. This will aid you in applying your brand across different areas and locations and other design teams.
A typical document will provide the user with guidelines for how to effectively use the logo, identity, brand colours, typography, stationary, and images. Guidelines are also given for promotional material and email templates and signatures. All information is packaged in a easy to use document, also consistent with your brand.