Also, worldbuilding touches all aspects of your story. It touches plot and character as well. If you don't know the culture your character comes from, how can you know what he's really like? You must know your characters on a much deeper level than you would if you just shrugged your way into a cookie cutter fantasy world.
Patrick RothfussWhen we are children we seldom think of the future. This innocence leaves us free to enjoy ourselves as few adults can. The day we fret about the future is the day we leave our childhood behind.
Patrick Rothfuss