Enlightenment is the belief that there are many, many planes of existence. All of these planes are interconnected and all effect each other through our actions, either directly or indirectly. A good example of how they effect each other is this:
Imagine a still pond, this being all interconnected planes. You throw a pebble into the pond, your throwing it into the water being an action. Where the pebble is thrown in, this is the part of the pond directly effected. The ripples created by you throwing the stone spread out and effect every part of the pond, making the entire pond being effected indirectly.