There are many different solutions to conduct specific businesses, but many businesses are categorised by sector. Some businesses will be small and centered on a single market, while others are large corporations that amount several industries. A great example of this would be the retail massive Walmart or Apple. Corporations define all their businesses by industry, including mattress production, advertising, and real estate. Businesses are defined by the type of transactions they function. ExxonMobil conducts business by giving oil to the customers.