Casement windows are hinged on one side and open outward, typically operated with a crank. This design allows for maximum ventilation and unobstructed views, making them popular in both residential and commercial buildings. They can be made from various materials, including wood, vinyl, and aluminum. These windows are often energy-efficient due to their tight seal when closed, reducing air leaks. Casement windows can be customized in size and style, fitting various architectural designs. They are commonly used in areas where fresh air is desired, such as kitchens and living rooms.