After-sales service, also known as customer service or customer relations service, is the set of activities that a company puts in place to manage the requests, complaints and problems of customers after the sale of a product or service. After-sales service is important because it can influence customer satisfaction and loyalty to the company. An effective after-sales service can help resolve customer problems quickly and prevent unnecessary complaints, while an ineffective after-sales service can lead to customer frustration and a loss of trust in the company.