Final answer:
Customer service is ensuring customer satisfaction by providing professional, helpful, high-quality service and assistance before, during, and after the customer's requirements are met.
Step-by-step explanation:
The definition of customer service is ensuring customer satisfaction by providing and delivering professional, helpful, high-quality service and assistance before, during, and after the customer's requirements are met. It involves taking care of the customer's needs by offering exceptional service. Meeting the customer's needs through professional and helpful assistance is an important aspect of customer service.