Kung fu styles? I'm really confused?

I'm really confused right now. Okay, so I know what kung fu is... It's a Chinese fighting style. But I understand that there are also different sub-styles of kung fu, like tiger, mantis, crane, snake, monkey and leopard. So, does each style use their own different moves, or does all the styles have the same? Is the "style" just the way the person does the kung-fu moves?