This report delves into the marketing essentials of McDonald's, a global fast-food giant. It examines the key roles and responsibilities of the marketing function, analyzes the marketing environment, and explores the interrelationship between marketing and other functional units. The report further investigates the application of the marketing mix in planning processes to achieve business objectives, comparing McDonald's strategies with those of Subway. Finally, it presents a comprehensive marketing plan for McDonald's, including a SWOT analysis, PESTLE analysis, and Porter's Five Forces analysis, outlining strategies for expansion and growth in the UK market.