Most web based classified according to the industry that they operate in. Some of these are large corporations that concentrate on a specific kind of industry, such as Apple or Walmart, although kauai-realtor.com others specialize in a specific type of goods and services. Examples of companies in which businesses may handle include advertising, mattress creation, real estate, and oil. ExxonMobil, for instance, runs business by providing oil to customers. Various other industries incorporate restaurants, stores, and other smaller businesses.