This report provides a comprehensive overview of various business structures, including micro, small, medium, and large businesses, as well as sole trader, partnership, limited liability, public limited liability, and cooperative models. It details the characteristics and examples of each structure. The report further explores how external factors, such as political, economic, social, technological, environmental, and legal (PESTEL) factors, affect businesses. A PESTEL analysis of Tesco is included to illustrate these impacts, examining how the company navigates changes in government policies, economic fluctuations, social trends, technological advancements, environmental regulations, and legal frameworks. The analysis highlights Tesco's strategies for adapting to these external influences, providing insights into the company's operational and strategic responses to a dynamic business environment.