The Four Elements:
* Water: Manipulating water in all its forms, including rain, ice, and blood.
* Earth: Controlling the earth, including rocks, sand, and metal.
* Fire: Bending fire, heat, and lightning.
* Air: Controlling the wind and air currents, as well as flight.
Other Elements:
* Spirit World: This isn't a tangible element, but a separate plane of existence inhabited by spirits. Some individuals can bend spirits, such as the Avatar and certain members of the Northern Water Tribe.
* Lava: This is a specific form of earthbending, focusing on the manipulation of molten rock.
* Metal: While a form of earthbending, metalbending requires a unique ability that's not possessed by all earthbenders.
* Bloodbending: This is a dark form of waterbending, where one can manipulate another person's blood.
The Avatar:
The Avatar is a unique individual capable of bending all four elements. They are the bridge between the physical and spiritual worlds, destined to maintain balance and harmony.
Beyond the Avatar Universe:
It's worth noting that "element" can also refer to things like air and water in real-world chemistry, but that's not the context you're referring to here.