Polarized light is light that vibrates in a specific direction. Normally, light waves vibrate in many directions, but when light is filtered or reflected, it can become polarized. This means that the waves align in a single plane, making the light easier to manage and analyze. Polarized light is commonly used in various applications, such as in sunglasses that reduce glare from surfaces like water or roads. It is also utilized in photography to enhance colors and contrast, and in LCD screens to control the light emitted from the display.