In the world of business and branding, there are 45 trademark classes that categorize the goods and services a company provides. They are part of an international classification system that helps to streamline trademark registration and protection. The classes range from Class 1, which includes chemicals used in industry, to Class 45 covering legal, security and personal services. Understanding these classes is crucial for businesses to protect their brand and avoid infringement issues. It's like a huge library where every business finds the right shelf for their product or service.