Simulation theory is pretty much what it sounds like; life is just a computer simulation. Now, this can work in two different ways, one way is that your consciousness is programmed and life is like a first-person shooter. The other way it could be a simulation is a historical simulator, creating everything in the world, including our individual consciousnesses. Think of it as Sid Meier's Civilization or The Sims, but incredibly realistic and we are just characters in the game. If the simulation is just of your consciousness, when you die, the simulation comes to an end and whoever is running it continues on with whatever theyre doing. Or you could have a new simulation start again, either you re-living your life or you could be put into a completely different time and place. It all depends on what the person running the simulator wants. If it is a historical simulator, a few things could happen. First is that the data that makes up who you are can be written back into the matrix and you could be reincarnated as a way to save and use data and memory effectively. Or for whatever reason, your life could be re-started again at another point in the history simulator. An interesting aspect about death in a simulation is that anything could happen. The simulation already has the code that created you, so it can do anything it wants with you. You can be re-programmed to go anywhere and to do anything after you die. All they have to do is input your data into the environment. The second aspect, which is a bit more terrifying is that the simulation could start and stop at any time. The simulation could have been started the last time you closed your eyes. All your memories were just written in and you think they were real. It could also stop the next time you blink your eyes, meaning youll never die. Youll just hang in cyberspace limbo until they restart the simulation; if they choose to restart the simulation at all.