In this 21st century, it is worth to saying the need for a vehicle, from four-wheelers to two-wheelers the demand of vehicle in the automobile sector is increasing day by day. With the rapid demand for vehicles, it is needless to say the raising of loss of energy in different aspects. In this review article, recovery of the loss of energy when we apply brakes on the wheels will be discussed. When a usual common vehicle applies its brakes, kinetic energy is changed to heat as friction between the brake pads and wheels. This heat is transferred to the system and the energy is effectively wasted. The total amount of energy lost in this way depends on how often, how hard and for how long the brakes are applied. The regenerative implies recovering energy and generating that for a new purpose. In a regenerative braking system, the heat energy which is produced during the application of the brake can be utilized for other purposes say to light up the light or charging up the battery etc. The use of regenerative braking system increases the work output for the same input resulting in better efficiency of the vehicle. This article was carried on to provide comprehensive information about regenerative braking systems. These systems provide economic benefits via fuel savings and prevention of material loss. Their use also contributes to a clean environment and renewable energy sources, which are among the most important issues on the global agenda. More comprehensive studies should be accomplished in this area.