Final answer:
Customer service is the support offered to customers after a sale, including assistance with products and services to ensure customer satisfaction.
Step-by-step explanation:
Customer service is an after-sale support provided to customers. It involves various forms of assistance and services that businesses offer to their customers before, during, and after a sale is made. This can include answering questions, solving product-related issues, offering refunds or exchanges, and providing technical support. Exceptional customer service is crucial for maintaining customer satisfaction and loyalty.