There are many different ways to conduct specific businesses, but most businesses are grouped by sector. Some businesses are small and aimed at a single market, while others are large corporations that amount several industrial sectors. A great example of this would be the retail large Walmart or perhaps Apple. Businesses define all their businesses simply by industry, which includes mattress production, advertising, and real estate. Companies are defined by the type of trades they perform. ExxonMobil performs business by providing oil to hop over to here it is customers.