Liquid crystal displays (LCDs) are flat-panel screens commonly used in devices like televisions, computer monitors, and smartphones. They work by manipulating light through liquid crystals, which can change their alignment when an electric current is applied. This process allows the display to show images and text in various colors. LCDs consist of several layers, including a backlight, polarizers, and the liquid crystal layer itself. The backlight provides illumination, while the polarizers control the light's direction. This technology is energy-efficient and offers a slim design, making it popular for modern electronic devices.