After-sales service, the activities of the various services offered in the sale of goods. Work from the marketing point of view, after-sales service is also a promotional tool. Tracking the follow-up stage, with the steps of the sales personnel to take a variety of forms, and after-sales service to enhance the credibility and expand market share, and improve the efficiency and effectiveness of the marketing.

Technical Support refers to a form of after-sales service of products to its product user, to help users diagnose and solve the obvious symptoms appear in the process of using the product, the technical problems that may be caused by the product.