A class, or category, is a way to group items, ideas, or people based on shared characteristics or qualities. For example, in biology, living organisms are classified into categories like mammals, birds, and reptiles based on their traits. This system helps in organizing information and understanding relationships among different entities. In everyday life, we often use categories to simplify decision-making. For instance, products in a store are categorized into sections like electronics, clothing, and groceries. This organization makes it easier for consumers to find what they need and compare similar items within the same class.