I get lots of rain where I live, what exactly causes it?
It is liquid water in the form of droplets. Usually happens when the droplets have condensed!
What does condensed mean?
It means got smaller. After condensed, it becomes heavy enough to fall under gravity.
So it goes up as a gas, then condenses and becomes heavier.  Cool! What makes the water go up in the first place?
Very cool! It is moisture moving along three-dimensional zones of temperature and moisture contrasts.