This dissertation investigates the impact of e-commerce strategies on the performance management of Marks & Spencer (M&S) within the UK retail sector. The research aims to evaluate the concept of e-commerce, analyze the effects of implementing e-commerce strategies, and recommend effective strategies for improved performance. The study includes an introduction to e-commerce, the background of M&S, and the research objectives and questions. A literature review explores the importance of e-commerce and its growth in the retail industry. The methodology section outlines the research approach, including the use of questionnaires. The findings and analysis present data on e-commerce strategies, their benefits for M&S, and associated challenges. The conclusion and recommendations suggest strategies for optimizing e-commerce to enhance M&S's performance. The dissertation provides valuable insights into how e-commerce influences business outcomes, customer engagement, and competitive advantages in the retail landscape, focusing on M&S as a case study.