Window blinds come in several varieties and are used to cover or provide privacy for windows. There are four main types: Venetian blinds have wide curved metal slats; Faux or PVC blinds are made of plastic and are durable but heavy; Composite blinds combine wood and polymers; Wood blinds are made of real wood but are the most expensive and prone to warping. Overall, window blinds provide style, privacy, and light control for windows at an affordable price.