In our world, there are four elements. Water, earth, air, and fire. I'm a waterbender. Toph's an earthbender. ...And Zuko is a firebender. Bending is like... well some of the people here compare it to magic, but that's not what it is at all. You're in touch with your element, and you have to discipline your body in order to be able to bend. Each element has a different form. And with waterbending... how strong you are can change with whether it's night or day. I'm stronger at night.