A game object generally represents a game element. A game object needs to be registered through AK::SoundEngine::RegisterGameObj() for each in-game element that can emit a sound. Game objects will usually be registered for each character, projectile, and so on. In some cases, however, you may want to assign game objects to different parts of an in-game element. For example, you can assign a different game object to each bone of a giant character so that the footstep sounds and the character's voice emanate from different locations within the 3D sound space.
Refer to Game Object Example for an overview of the role of game objects in the integration of the sound engine into your game, and Integration Details - Game Objects for more detailed information.