This document discusses the three main types of businesses according to their activities: service businesses, merchandising businesses, and manufacturing businesses. It provides examples of businesses that fall under each type and describes their key characteristics. Specifically, it defines service businesses as those that offer intangible products/services, merchandising businesses as those that buy and resell products, and manufacturing businesses as those that combine raw materials into new products. The document also outlines the advantages and disadvantages of each type of business.