This report, titled "To review the impact of customer relationship management practice on the overall sales of an organisation: case study of Amazon UK," explores the crucial role of CRM in enhancing business functions, with a specific focus on Amazon UK. The report examines CRM's terminology, including its application in maintaining B2B relationships, and analyzes various CRM theories and models. It investigates how Amazon UK utilizes CRM to boost sales, particularly through the marketing and sales of its smart point devices to restaurant businesses. The research employs a detailed literature review, research methodology, and competitive analysis to assess the impact of CRM practices on Amazon's sales, market share, and customer satisfaction. The study highlights the importance of effective customer interaction, tailored marketing strategies, and the use of technology to improve customer relationships and drive sales growth, concluding with a comprehensive overview of Amazon UK's CRM strategies and their effectiveness.