1. Pre-sale consultation: provide information about products and services to potential customers, answer customers' questions about product functions, specifications and prices, and help customers make purchase decisions.
2. After-sales service: provide technical support and troubleshooting for customers who have purchased products, solve problems encountered by customers during use, and ensure customer satisfaction.
3. Customer relationship maintenance: establish good communication with existing customers, maintain interaction with customers in daily work, and understand and meet customer needs. Handle complaints and disputes, and find appropriate solutions to problems.