Reincarnation is an idea found in some popular cultures that when a person dies, they come back to life in another body. It means that someone who died hundreds of years ago might come back as someone in the present day. In cultures where reincarnation is believed in, it gives people hope that life will continue on in some way after death. Most religions and cultures that believe in reincarnation also believe that how you choose to live your life now will decide how you will come back in your future lives.