Most web based classified based on the industry that they operate in. Some of these happen to be large corporations that give attention to a specific type of industry, such as Apple or Walmart, even though other folks specialize in a certain type of service or product. Examples of industries in which businesses may buy and sell include promoting, mattress creation, real estate, and oil. ExxonMobil, for instance, does business by providing oil to customers. Other industries consist of restaurants, stores, and how to find a course that offers the right degree program other small enterprises.