There are many different ways to conduct individual businesses, how to make a board work but the majority of businesses are classified by sector. Some businesses happen to be small and concentrated on a single sector, while others are large enterprises that course several industrial sectors. A great example of this would be the retail large Walmart or perhaps Apple. Corporations define the businesses by simply industry, including mattress production, advertising, and real estate. Businesses are defined by the type of deals they do. ExxonMobil conducts business by giving oil to it is customers.