Looking at the functional orientation of the marketing department, it is generally necessary to contact customers, and the degree of contact is different. Generally, the sales department mainly sells products to customers and carries out customer maintenance, and supports some sales activities, such as promotion. Marketing department, some enterprises function as supervision department, which mainly supervises sales work and deals with customers, but less; Some enterprises plan and or plan, mainly for brand promotion activities or market research. And it needs to be close to the market, that is, close contact with customers. There are also some enterprises that have both functions and need to contact customers frequently.