Window
From Simple English Wikipedia, the free encyclopedia

A window of a house in England
A window is an opening within a wall of a building, in a car etc., to let air and light in. It is usually filled with a sheet of glass. They can be many different shapes, including rectangular, square, circular, or irregular shapes.
In a operating system similar to Microsoft Windows or Mac OS, a window is a part of a screen that displays some data to a user. There are many different windows, for example web browser.