Selling and salespeople play important roles in business. Personal selling involves building relationships to help customers discover solutions that are mutually beneficial. The duties of salespeople vary depending on their role, but may include prospecting, communicating, selling, servicing customers, and providing information to their company. While sales careers have benefits like independence and financial rewards, they also have challenges such as variable income and long hours. Successful salespeople possess traits like motivation, trustworthiness, communication skills, and the ability to understand customers' needs.