A complaint expresses customer dissatisfaction with a product or service where the customer expects a response. Customers complain when their expectations are not met, to release anger, or to help improve service. Complaints are a "gift" that allow businesses to increase customer trust, build long-term relationships, and engage customers as advocates who publicly support the business. To properly handle complaints, businesses should listen, repeat the issue, apologize, acknowledge the problem, explain how it will be addressed, thank the customer, follow up, remain calm and focus on the problem rather than taking it personally. The goal is to turn unhappy customers into satisfied ones.