Light, or illumination, is a form of energy that allows us to see the world around us. It travels in waves and can be produced by natural sources like the Sun or artificial sources like light bulbs. Light is essential for vision, as it reflects off objects and enters our eyes, enabling us to perceive colors and shapes. The behavior of light can be described by various properties, including reflection, refraction, and dispersion. Reflection occurs when light bounces off surfaces, while refraction happens when light passes through different materials, changing its speed and direction. Dispersion is the separation of light into its component colors, as seen in a rainbow.