Windmills are devices for taking power from the wind, and converting it to other forms of energy which may be applied to specific tasks.
There are 3 main categories of windmill:
"traditional" English or Dutch style windmills, mostly used for grinding or drainage
windpumps, (normally made from metal) used throughout the world for pumping water (and what most Americans think of when they talk of windmills)
wind turbines used for generating electricity
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Information on renewable energy itself, but not primarily relating to wind energy technologies, belongs in the main category on Science/ Technology/ Energy/ Renewable/.