This report provides an in-depth analysis of marketing essentials, focusing on the key roles and responsibilities of the marketing function within an organization. It uses ASDA Plc, a global retailer, as a case study to illustrate these concepts, examining how marketing relates to the wider organizational context and interrelates with other functional units such as finance, human resources, and research. The report explores the significance of marketing planning, including market research, product development, communication, promotion, and distribution, as well as the application of different marketing concepts like production, product, selling, marketing, and societal concepts. Furthermore, it compares the marketing mix of ASDA with its competitor, TESCO, and concludes with an evaluation of marketing strategies and planning to meet marketing goals and objectives. The report emphasizes the importance of setting objectives, marketing strategies, market information systems, marketing research, segmentation, and brand equity in achieving business success.