Car rental system is software developed in java which helps car retailers to rent their cars to a particular customer on the rental basis. It is an easy to use software developed and is needed to keep track of all the car and customer details which is stored in a database. It stores details like car history details, parts details, engine details and more. In this system, the customers can register themselves on the site and then log in and view cars that they want to take and then they are able to get all details like car rental details, mileage details, and the cost. There is a payment mode through which they can book a car. There is an administrator who maintains all the details about the customer and can edit or modify it. earlier there was no such system so the customer has to go to the car dealer and then book the car but now it is automated and so it is a secure and reliable system.