A Car Rental Management System is looking to develop a state-of-the-art car rental portfolio management system which is able to track their car rental booking history and billing and car details. This system facilitates the owner of the Car Rental Company to retrieve, update and track and delete the bookings and cars efficiently. At the same time, can utilize this system to monitor their financial management. Currently, different locations of the car rental company have their own separated systems leading to lack of communication and inefficient data sharing. For example, the car rental company located in Mumbai uses simple Microsoft Excel to keep the record of their customers, cars and insurance of their cars which is inconvenient to retrieve and update the cars and customer's information. In the car rental company located at Dharwad, maintain a book-based ledger to keep a record of their customers and cars and the insurance for the same. The main branch of the company located in Bengaluru has to keep the customer and car details of all their branch offices on their own computer system. While each statement serves a distinctive process, there is no coordination, assimilation and representation of data. The systems may have duplicate data which leads to waste of space. The different systems also may have different application programs which cause incompatible files. Due to these disadvantages of the current system, a car rental management system is proposed. Car Rental Management System is a database management system (DBMS) which is based on computer networks, using the advance database technology to construct, maintain and update various kinds of data in data base system. The DBMS can track and update all the information of the cars available and customers during a particular time span. The major advantages of the DBMS are easy to retrieve and update information, efficient data sharing and communication and reliable backup and security. Information about cars is done by just writing the car name, car model and insurance details. Whenever a new car is added to the company its information is stored freshly. Bills are generated by recording the usage of the car by the customer. Details of the customer are updated on a written sheet and at last, they all summed up. Car usage details are recorded on the document, which contains the customer information. It is destroyed after sometime time period to decrease the paper load in the office. The admin themselves have to track the car details and customer details which is a tedious job.