Inherits from Behaviour
Reverb Zones are used when you want to gradually change from a point
where there is no ambient effect to a place where there is one. for example you can gradually change your character's footsteps sounds and create the feeling like you where entering into a cavern, going trough a room, swimming underwater, etc.
You can always mix reverb zones to have combined effects. For more info check Reverb Zones in the manual.