A vertical axis wind turbine (VAWT) is a type of wind turbine where the main rotor shaft is positioned vertically. This design allows the turbine to capture wind from any direction, making it more versatile than horizontal axis wind turbines (HAWTs). VAWTs are often used in urban areas and on rooftops due to their compact size and lower noise levels. There are two main types of VAWTs: the Darrieus and the Savonius designs. The Darrieus turbine has curved blades that resemble an eggbeater, while the Savonius turbine consists of scooped blades that catch the wind. Both types are effective in generating renewable energy from wind.