This document presents a car rental system project that aims to improve upon existing car rental services. It discusses developing a web and mobile-based application to allow customers to book cars online from anywhere in the world. The proposed system would have a centralized database to manage car reservations and provide reports on vehicle availability, revenues, and costs. It describes designing the system using techniques like data flow diagrams, sequence diagrams, and considering user requirements and security. The goal is to make the car rental process more convenient and efficient for both customers and the rental company.