As Cynthia stated, many people have different beliefs as to what will happen when we die. Some believe in the concept of Heaven and Hell, while others believe in reincarnation. Still others believe that nothing happens at all what so ever. The truth is, none of us knows what happens to our spirits, to our souls, upon our deaths. Every single belief out there is based on faith.
We all want to live eternally, and to have ever lasting life. The way that we do this is to create a life that is worth remembering for all time. We don't have to be rich or famous to do that. We simply live our lives to the best of our abilities, and strive to have a positive impact on as many people as we can. This way, when our bodies to pass on, the lives that we touched will remember us. They will pass our stories down through the generations, and we live on.
When you die, your soul leaves your body. There are many religions who believe different things. Some believe after you die you will go to Heaven if you lived a good life. Others believe you will go to Hell if your life was a bad one. It goes even further than this in some religions. If you are a religious person you can ask your Preacher etc. about what happens to you after you die. It's something that will happen to all of us in a time that is unknown to us.
Everyone has different beliefs about what happens when you die. Basically your body stops functioning, your organs shut down, your brain stops telling your organs to work, your heart stops pumping blood, and you cease to exist. What happens after that, no one knows except those who have gone before us.
No one can really answer that question with any certainty since obviously we have not died. There are many religions and people who believe a variety of different things. Some believe in reincarnation, some believe in heaven and hell, some believe in spirits wandering the earth if they had unfinished business. You can believe in all of that or none that is your choice.