A light source is any object or device that emits light, which is a form of electromagnetic radiation visible to the human eye. Common examples of light sources include the Sun, light bulbs, and LEDs. These sources can produce light through various processes, such as combustion, incandescence, or electroluminescence. Light sources can be classified into two main categories: natural and artificial. Natural light sources, like the Moon and stars, occur in nature, while artificial light sources are created by humans, such as flashlights and neon signs. Both types play essential roles in our daily lives, providing illumination and enabling visibility.