Identifies what kind of camera this is, using the CameraType enum.
Regular cameras in your scene have a value of CameraType.Game, both at runtime and in the Unity Editor. Cameras that render different parts of the Unity Editor have other values; for example, cameras that render the Scene view have a value of CameraType.SceneView.
This is useful in the Scriptable Render Pipeline, where you can define different rendering behavior for Unity Editor cameras as well as cameras in your scene.
Additional resources: CameraType