Marketing is used by all industries—business, retail, software, manufacturing, the media—any company with a product or service to sell needs marketing support. Principles of Business: Marketing provides easy-access to the essentials of marketing—advertising, copy writing, social media, branding—are all covered here. These 100 easy-to-understand entries walk students and researchers through the process that is marketing, to give readers a better understanding of what is involved in marketing a product or service.