LCDs, or Liquid Crystal Displays, are a type of screen technology commonly used in televisions, computer monitors, and smartphones. They work by using liquid crystals that change their alignment when an electric current is applied, allowing light to pass through or be blocked. This process creates images by controlling the amount of light and color displayed on the screen. One of the main advantages of LCDs is their energy efficiency compared to older technologies like CRT (Cathode Ray Tube) displays. LCDs are thinner and lighter, making them easier to mount on walls or carry around. They also provide sharp images and vibrant colors, which enhance the viewing experience for users.