Systems help you create animations that would be much more difficult or time-consuming to produce using features independently.

Sunlight creates and animates a directional light that follows the geographically correct angle and movement of the sun over the earth at a given location.
Daylight creates an assembly with a sky and a sun. Using the Get location function you can create and animate a light that follows the geographically correct angle and movement of the sun over the earth at a given location.
Systems are primarily intended for plug-in component software. Additional systems might be available if your configuration includes plug-in systems.
You can externally reference system objects in your scene. For more information, see XRef Objects.