Most web based classified according to the industry they operate in. Some of these happen to be large companies that concentrate on a specific form of industry, such as Apple or Walmart, although other folks specialize in a certain type of goods and services. Examples of market sectors in which businesses may perform include advertising and marketing, mattress creation, real estate, and oil. ExxonMobil, for instance, performs business by providing oil to customers. Other industries contain restaurants, stores, and learn about data rooms for real estate professionals other small businesses.