It is one of the hybrid methods. Unlike full-hybrid systems in which an electric motor actively intervenes, most mild hybrid systems only assist the engine during driving, and cannot drive with an electric motor alone. However, it is a widely used technology in the European market because it can improve energy efficiency at a relatively low cost. As the name suggests, the 48V mild hybrid is a mild hybrid system in which the voltage is increased to 48V. Although it supports the engine, it uses high voltage to operate the air conditioner compressor and water pump with electricity. It adds an electric turbo to enhance both performance and efficiency.