This report, submitted by Cao Ngoc Ngan Thuong, addresses key aspects of marketing essentials within a BTEC Level 4 HND Diploma in Business framework. It begins by defining marketing, its role, and its interrelation with other functional units, highlighting the importance of understanding customer needs and market dynamics. The report details various marketing concepts, including production, product, selling, marketing, and societal concepts, alongside an analysis of the external environment's impact, encompassing social-cultural, economic, technological, demographic, and political factors. It outlines the marketing process, including strategic planning, marketing mix, and the ten steps of strategic marketing planning, emphasizing the importance of market research, SWOT analysis, and budget considerations. The report also discusses the role of the marketing department in organizations, its role in communication, customer relationship management, and promotional activities, emphasizing how it defines an organization's image and fosters long-term customer relationships. The report fulfills the assessment criteria by explaining the roles and responsibilities of marketing, analyzing the marketing environment, and evaluating the key elements of the marketing function and their interrelationships with other organizational units.