LMP3, or Le Mans Prototype 3, is a class of sports car racing introduced by the Automobile Club de l'Ouest (ACO) as an entry-level category for prototype racing. These cars are designed to be less powerful and less expensive than their LMP1 and LMP2 counterparts, making them more accessible to amateur and semi-professional drivers. LMP3 cars typically feature closed-cockpit designs and are used in various endurance racing series around the world, including the European Le Mans Series, the Asian Le Mans Series, and the IMSA Prototype Challenge. They serve as a platform for developing driver talent and providing exciting racing competition.