The document discusses the process of character development in games. It explains that character development involves both creating the 3D model and avatar as "the body", as well as designing the game environment and rules as "the mind or soul" that allows the character to evolve through interactions over time. Many tools can be used to create 3D models and rig them for animation to serve as characters in a game. Once imported into a game engine, the model becomes an avatar that can navigate the virtual world based on the environment, physics, input devices, other players, and game AI.