In Buddhism, the belief of reincarnation is a necessary prerequisite for understanding karma fully, and the possibility of transformation. The three-part cycle of reincarnation includes birth, death and the bardo state between death and our next rebirth. Even if we struggle with the concept of past and future lives, we can see how we have each lived many lives in this one. Parts of us die, parts of us are born again and we find ourselves in various heaven and hell realms. These rebirths happen cyclically as a result of habit, but we can end the cycle and step into nirvana by following the Buddhist path.