Light is everywhere. It's even in the room your in right now! You need light to see everywhere. With light you can see color, shapes, objects, and almost everything! Some objects that give off light are the sun, light bulbs, evan some bugs. (Fire Fly) The sun can also give off heat. Light bulbs also give off heat.
Light can give you a message to your eyes and brain. It tells you if the light is to bright for your eyes. Which counts as giving you a message to your brain. Also light can give out colors like, orange, pink, blue, and many more. There are a lot of ways light can do for us. Either good or bad. But there is even more light can do for everything that I didn't even explain.