There are several common types of windows used in buildings, each serving different purposes. Double-hung windows have two sashes that slide up and down, allowing for ventilation from both the top and bottom. Casement windows are hinged on one side and open outward, providing excellent airflow and unobstructed views. Sliding windows consist of two or more sashes that slide horizontally, making them easy to operate and ideal for wide openings. Awning windows are hinged at the top and open outward, which helps keep rain out while allowing fresh air in. Each type offers unique benefits for homeowners.