This project presents Thrifter, a web-based e-commerce platform designed specifically for buying and selling second-hand products. Built using the MERN stack, it addresses the limitations of traditional e-commerce systems by focusing on sustainable shopping and personalized user experience. The platform includes features such as product browsing, cart management, and AI-powered recommendations to improve product discovery. By promoting reuse and eco-friendly consumption, Thrifter supports sustainable retail practices while providing an intuitive and user-friendly interface.