E-commerce has revolutionized the retail trade by offering business in a cost-effective way to reach the global public and simplify the purchasing process. However, the success of very competitive online marketplace depends significantly on user experience (UX) optimization. A well -designed UX increases the engagement, increases the conversion frequencies and improves customer Attention. This research examines the effect of UX on performance on e-commerce, mobile responsibility, individual shopping experiences, intuitive navigation and optimization of side loading speed. Through case study and industry trends, studies show how UX improvement increases customers' satisfaction and long -term trade development. In addition, new technologies and innovative UX practices are analyzed that will shape the future of ecommerce. Conclusions emphasize UX's important role in maximizing profitability and maintaining customers in a developed digital scenario.