Window sill is a term that refers to the ledge at the bottom of the window. It’s located where the window frame meets the wall. The sill provides a structural foundation for the window. On the outside, it is used to direct water away from the house and keep the frame well-insulated.

A windowsill (also written window sill or window-sill, and less frequently in British English, cill) is the horizontal structure or surface at the bottom of a window. Window sills serve to structurally support and hold the window in place.

The window sill is the horizontal surface at the bottom of a window frame. It’s also known as a windowsill, cill, or stool. The primary function of a window sill is to provide structural support for the entire window system and prevent water from entering your home through gaps between the wall and frame.

A window sill is the flat, horizontal surface located at the bottom of a window. It can be found on both the interior and exterior of the window, serving as a ledge that protrudes slightly from the wall. The window sill is a critical component that not only supports the window itself but also provides a finished look to the installation.