A window is an opening in a wall, door, roof, or vehicle that allows the passage of light and may also allow the passage of sound and sometimes air. Modern windows are usually glazed or covered in some other
transparent or
translucent material, a sash set in a frame in the opening; the sash and frame are also referred to as a window. Many glazed windows may be opened, to allow ventilation, or closed, to exclude inclement weather. Windows may have a latch or similar
mechanism to lock the window shut or to hold it open by various amounts.
Various examples of windows
In addition to this, many modern day windows may have a window screen or mesh (often made of aluminum or fibreglass) to keep bugs or insects out when the window is opened.