This report provides an analysis of consumer behavior in relation to Coca-Cola, a leading non-alcoholic beverage company. It explores the influences of consumer groups, including geographical concentration, gender, family, age group, lifestyle, personality, psychological factors, attitude, occupation, and sociological influences. The report highlights the importance of culture in consumer purchasing decisions and discusses group identifiers and the role of group dynamics, including primary, secondary, formal, informal, membership, and symbolic groups. It outlines the consumer decision-making process, from need recognition and information search to evaluation of alternatives, purchase decision, and post-purchase behavior. The report concludes with recommendations to address post-purchase dissonance and enhance customer loyalty, such as increasing product usage, conducting surveys, diversifying product lines, promoting healthier options, reducing water consumption, improving customer service, avoiding plastic usage, meeting consumer expectations, and enhancing communication processes. The study underscores the significance of understanding consumer behavior to maintain a competitive edge and foster brand loyalty.