Although these are two different areas they are closely connected. Sales professionals are all-round business people who use their problem-solving skills to understand, anticipate and meet customers’ needs. There are two types of sales Business to business (B2B) and business to customer (B2C). Companies sell products or services to their customers by raising their expectations of what those products / services can do for them. The job of the customer-service sector is to ensure that those expectations are fulfilled.