While it is simple to misunderstand both terms, companies demand you to have a comprehensive overview of the two terms. Interviewers can ask this change management interview question to see how well you comprehend ITIL concepts, not just these terms. Although many use these terms interchangeably, they do not imply the same thing. The individual who uses a company's goods is referred to as an end-user. The individual may or may not be engaged in the purchase of the specific goods. A customer, on the other hand, is someone who buys a product from a business. A customer may not be a good end user. On the other hand, a single person can be both a customer and an end-user of a good or service.