A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. They are formed from the remnants of massive stars after they undergo supernova explosions.
Event Horizon: The boundary around a black hole beyond which no light or other radiation can escape.
Singularity: A point at the center of a black hole where density becomes infinite and current laws of physics cannot describe its conditions.
Supernova: A powerful explosion that occurs when a massive star exhausts its nuclear fuel and collapses under its own gravity.