This report examines the impact of internal and external factors on business performance, using Marks & Spencer as a case study. The report begins with an introduction to the concept of business and its relation to profit-making, followed by an analysis of how internal factors like employees, managers, money, resources, and company culture, as well as external factors such as political, economic, social, technological, environmental, and legal factors, influence the company. The main body then discusses how Marks & Spencer is affected by these factors, including free trade, inflation, consumer behavior, technological advancements, environmental concerns, and legal regulations. The report also explores how Marks & Spencer impacts the external environment through its green policies, competitive strategies, technological adoption, and adherence to legal and ethical standards. The conclusion summarizes the importance of considering both internal and external factors for business sustainability and growth, emphasizing the significance of customer and employee relationships. The report includes references to books and journals supporting the analysis.