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Home windows A window shutter is similar to a door for a window, usually made of a sturdy material and often louvered, whose original purpose was to protect windows or the interior of a building from extreme weather conditions. In many modern residential constructions, decorative shutters are attached to either side of windows strictly for visual appeal. A window is an opening in an otherwise solid, opaque surface through which light can pass. For example, a window in the wall of a house, or a window in a scientific measurement device that permits reading of certain wavelengths. Window is also used metaphorically to refer to a time period during which something can occur and outside of which the thing cannot occur, as in a window of opportunity to launch a rocket to the moon on the most efficient trajectory. The word Window dates back to Old Norse "Wind Eye"; opening to the air.
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