An avatar is a digital representation of a user, from simple icons to detailed 3D models, used in online spaces for identity; in James Cameron's Avatar franchise, it's a genetically engineered, human-mind-controlled Na'vi body used to interact with Pandora's inhabitants, while in Avatar: The Last Airbender, the Avatar is a powerful spiritual leader with control over all four elements. Descriptions vary greatly, but generally involve customized appearance, personality, and function within a virtual world or story.