The slot the emitted particles will operate under. (They are not actually placed under this slot, but they visually behave as though they are).
Behaviour
The ParticleSystem component acts as the interface between a particle style and one or more particle emitter. With it, multiple emitters can use the same source ParticleStyle. Alternatively, multiple ParticleSystems can be used with the same style but different simulation spaces to avoid the need for multiple style components. This is especially handy when properties of the style need to be dynamically changed as it can be done fro ma centralized location.
