Window wedges, also known as window wedges or window spacers, are devices that are used to prevent windows from closing too tightly or to hold them open at a certain width. They are typically made of a flexible material such as rubber or plastic, and they are placed between the window frame and the window sash to create an opening through which the window can be opened wider. Window wedges can be useful in various situations, such as when you want to allow more fresh air into a room or when you need to open a window for emergencies. They are also often used to hold windows in a partially opened position when children or pets are present.