A window blind is a type of window covering. There are many different kinds of window blinds which use a variety of control systems. There are many different kinds of window blinds which use a variety of control systems. Blinds are not just about keeping heat in but they are a means to filter light in and out of the room. Blinds are a great way of stopping direct light coming into the house, without blocking out the view or making it feel like night time. Blinds are mostly installed inside the home but they don�t have to be. Blinds can be made of Wood, Aluminium, Fabric and plastic. Blinds usually come down across the window horizontally from a cord or pulley.