P365 - DAY237: Windmill

A windmill is a mill that converts the energy of wind into rotational energy by means of vanes called sails or blades. Earlier, windmills usually were used to mill grain, pump water or both.

However, the majority of modern windmills take the form of wind turbines used to generate electricity (like this), or windpumps used to pump water, either for land drainage or to extract groundwater.