This report provides a comprehensive analysis of different types of companies, including micro, small, medium-sized, and large businesses, along with their respective characteristics. It explores various business structures such as sole traders, partnerships, limited liability partnerships, and cooperatives, highlighting their features and operational aspects. The report also delves into how organizational structures, including functional, divisional, team, and virtual structures, affect business productivity and efficiency. Furthermore, it applies a PESTLE analysis to examine the external factors influencing businesses, such as political, economic, social, technological, environmental, and legal factors, using Sainsbury as a practical example. The conclusion summarizes the key findings, emphasizing the impact of macroeconomic factors on organizational structures and the importance of being adaptable to external influences.