Hybrid electric vehicles are automobiles which make use of a combination of conventional propulsion systems and rechargeable energy storage systems (RESS). The purpose for combining these two different power sources is to achieve improved fuel economy in hybrid electric vehicles compared to the conventional cars and trucks. Moreover hybrid electric vehicles incorporate propulsion systems in addition to the electric motors, in order not to be hampered by charging units the way it happens with battery electric vehicles (BEVs).

Today has seen the mass production of hybrid electric vehicles coming from a number of well known car manufacturers. The reasons why many car producers jump on the green bandwagon are varied. Whether there is a genuine interest in saving energy and not using the planet’s energetic sources, or a smart and "caring" way to attract buyers and thus sell more cars, one cannot be certain. There are three main ways that allow current hybrid electric vehicles to reduce gas consume. First, they lower the amount of wasted energy during idle or low input (turning off the ICE); secondly, they collect waste energy (regenerative braking), and thirdly, they reduce the size and power of the ICE and inefficiencies generated by under-utilization.

The batteries that supply the electric motor get charged when you drive around, thus preventing the input necessities. Some hybrid electrical vehicles designs depend on the use of an electric generator that is spun by the engine and allows the recharging of the battery. The majority of hybrid electric cars can now cut out the toxic emissions that are exhaled during the idle or restart modes of the engine. The engines of the hybrid electric vehicles are smaller than those of non-hybrid petroleum fuel vehicles. These engines may work at various speeds, thus bringing more efficiency.

The making of the hybrid electric vehicles started in the late 1990s and the first ones came from Honda (Honda Insight) and Toyota (Toyota Prius). Even since beginnings of hybrid electric vehicles they have become widely available to the buyers. The future of hybrid electric vehicle is definitely bright. This is the forecast by some automobile makers who label hybrid electric vehicles a core segment of the automotive market of the future.

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