A brand guide is like your companies rule book. It explains how a company or organization will present itself to the customers, users and the world! A brand guide would include the logo, font, color palette, marketing material, photography and more.
Using this guide will allow you to know how and when to use different variations of your logo. It will also help you understand what to and what not to do when using your logo on different marketing materials.
tGse Note: It is important to know what not to accept when moving from one graphic designer to another!
Not all brand guides are the same! You may at times be offered a small brand guide package other than a larger brand package guide with more valuable details! Make sure you do your research so that you get everything that you may need in your brand guide.