Most web based classified based on the industry they operate in. Some of these will be large businesses that give attention to a specific kind of industry, such as Apple or perhaps Walmart, even though resource others specialize in a particular type of goods and services. Examples of industrial sectors in which businesses may perform include marketing and advertising, mattress creation, real estate, and oil. ExxonMobil, for instance, runs business by providing oil to customers. Various other industries incorporate restaurants, shops, and other small businesses.