Venetian blinds are slatted blinds, consisting of a number of long horizontal strips attached in rows. Metal Venetian blinds are nearly always made of Alluminium.
The slats are usually connected with string such that they may be turned to either allow light to pass through them by becoming parallel with the window-sill, or else turned flat to block light from outside. Usually the turning of slats is accomplished by rotating a metal or plastic piece found at the upper-corner of the blinds. A string or pull allows the blinds to be raised, as well, removing them entirely from obscuring the window.