So many brands, so many logos, you only have to walk through your local supermarket (Tescos is a brand) and can be easily confused by the number of brands. A brand is a mark a trademark; think of the John Wayne films where the cowboys on the range branded the cattle. So a brand is telling other people. "Hands off its mine" or "I made this" It is about business identity and is the most important area in your business.  If you have a good product or service then protect it now and shout "This is mine""