The document discusses the difference between consumers and customers. A consumer is defined as the end user of a product or service, while a customer is anyone who pays for a good or service. The main difference is that the consumer is the final user, while the customer pays but may or may not be the end user. An example is given of a birthday party where the guests (consumers) eat the cake but the friend (customer) who paid for the cake. Various types of customers are also outlined such as repeat customers, discount customers, and trade customers.