Liquid Crystal Displays (LCDs) are flat-panel screens commonly used in devices like televisions, computer monitors, and smartphones. They work by using liquid crystals that change alignment when an electric current is applied, allowing light to pass through or be blocked. This process creates images by controlling the intensity of light for each pixel. LCDs are energy-efficient and provide sharp images with good color reproduction. They typically consist of several layers, including a backlight, polarizers, and the liquid crystal layer itself. This technology has largely replaced older display types, such as cathode ray tubes (CRTs), due to its slim profile and lightweight design.