Storm windows are additional windows installed on the exterior or interior of existing windows to provide extra protection against harsh weather conditions. They help reduce air leaks, improve insulation, and can lower energy costs by keeping homes warmer in winter and cooler in summer. These windows are typically made of glass or clear plastic and can be fixed or removable. Storm windows are especially useful in areas prone to severe weather, as they can help prevent damage from high winds, rain, and flying debris, enhancing the overall durability of a home.