2. General relativity holds that once an object enters a black hole, all knowledge of it is lost beyond the event horizon. The black hole information paradox refers to this. The question of what happens to the information arises since quantum theory contends that information cannot be destroyed. The holographic principle, which postulates that information is encoded in the event horizon, and the firewall paradox, which posits that the event horizon is actually a firewall that destroys anything that falls into a black hole as solutions, are examples of proposed solutions.