This research project investigates the impact of marketing activities on the business performance of Tesco PLC, a leading brand in the United Kingdom. The study aims to determine various marketing activities related to business performance, identify the relationship between marketing activities and competitive advantage, and evaluate different methods for assessing current and future business performance in relation to marketing. Data analysis, utilizing thematic analysis, reveals customer perceptions regarding Tesco's services, satisfaction levels, and factors influencing purchasing decisions. The research also explores customer opinions on Tesco's diversification, suitable sectors for expansion, marketing expenditure, and international business expansion. Recommendations emphasize the importance of regular market research, understanding changing customer needs, increasing product lines, and enhancing customer satisfaction to achieve short and long-term targets and gain a competitive edge.