The two main uses for windmills are pumping water from a well and generating electricity.
Mainly to grind corn and other seeds, turning them to flour.
windmills are used now for mainly wind energy but in the old times the dutch used them to grind corn and wheat for flour
Windmills can be used to power the planet. In Ireland 200 windmills power 10% of the homes in Ireland. Windmills can be used to power the computer screen you're looking at right now.Wind energy.
Windmills can be used in different countries
Windmills are used to kill birds