This report provides a comprehensive analysis of marketing essentials, using Wilkinson and Cadbury as case studies. It begins with an introduction to marketing, defining its core concepts and importance. Task 1 delves into the duties of the marketing function, outlining its roles in collecting market information, planning, product design, standardization, packaging, branding, customer services, pricing, promotion, and physical distribution within Wilkinson's context. Task 2 explores how the marketing function relates to various organizational departments like HR, customer service, finance, administration, and IT. Task 3 compares Wilkinson and Cadbury using the 7Ps of the marketing mix, examining product, price, place, promotion, people, process, and physical evidence strategies. The report concludes with a summary of key findings and references.