Most web based classified in line with the industry they will operate in. Some of these happen to be large firms that give attention to a specific type of industry, such as Apple or Walmart, although blog link others specialize in a certain type of products or services. Examples of industrial sectors in which businesses may buy and sell include promoting, mattress creation, real estate, and oil. ExxonMobil, for instance, does business by giving oil to customers. Other industries include restaurants, boutiques, and other small businesses.