Tide mills are water-powered mills that harness the energy of tidal movements to grind grain or perform other tasks. They operate by using the rise and fall of tides to create a flow of water, which turns a wheel connected to machinery. This technology was commonly used in coastal areas where tides are significant. Historically, tide mills were important for local economies, providing a reliable source of power before the advent of modern electricity. They can be found in various locations around the world, often near estuaries or coastal regions, and are a fascinating example of early renewable energy use.