This report examines various types and sizes of businesses, focusing on how they operate and the factors that influence them. It begins by differentiating between micro, small, medium, and large enterprises, outlining their characteristics and providing examples. The report then explores different organizational structures, including sole traders, partnerships, limited liability businesses (LLPs and Ltds), public limited companies (PLCs), and cooperatives, detailing their definitions and features. Furthermore, it delves into different organizational structures like functional, hierarchical, divisional, flat, and matrix structures, analyzing their impact on productivity. The report also includes an external analysis using the PESTLE framework to assess the political, economic, social, technological, legal, and environmental factors affecting businesses, with Tesco PLC as a case study. The report highlights how these external factors influence business operations and strategies.