Window sill
A window sill is the surface at the bottom of a window. Window sills serve to hold the window or glass in place and also provide a mechanism for the shedding of rain water away from the wall directly below the window.
A window sill can be the horizontal piece below a window unit in masonry construction or in wood framing. The sill of the window frame sits on the window sill of the wall opening. The lowermost, interior trim work on a window may also be referred to as a window sill.
