Telemarketing is a very common and widely used method of contacting potential customers. There are some important laws regulating telemarketing that companies are responsible for learning and following. Learn about them in this lesson. Telemarketing is a very common form of marketing companies use to connect with potential customers of their products or services. Historically, Telemarketing Services consisted of companies making telephone calls to existing or potential customers. Many telemarketing companies offer inbound and outbound telemarketing services. Representatives are trained on the nature of your business and how to interact with your customers both when making and receiving different types of calls. Thanks a lot to all.