Cameras

Cameras are essential in the 3D world, as they act as a viewport for the scene. Look at the following screenshot:

Cameras can be placed at any point in the world, animated or attached to characters or objects, as part of a game scenario. Many cameras can exist in a particular scene, but often a single main camera will always render the majority of what the player sees. This is why Unity gives you a main camera object whenever you create a new scene.