The word "light" can refer to several concepts. Primarily, it denotes electromagnetic radiation that is visible to the human eye, allowing us to see the world around us. It can also refer to the brightness generated by this electromagnetic energy. Additionally, "light" is used to describe something that has little weight or is not heavy, as well as to convey feelings of joy or cheerfulness.
The word "light" originates from the Old English "leoht," which is related to the Germanic root "leuhtam," meaning "light" or "bright." This word has cognates in other Germanic languages, reflecting the concept of brightness or illumination.