A black hole is an astronomical object with an intense gravitational pull from which nothing, not even light, can escape. Formed from the remnants of massive stars after they collapse under their own gravity, black holes come in different sizes, primarily categorized as stellar and supermassive. The boundary around a black hole is known as the event horizon, beyond which escape becomes impossible. Black holes remain an area of active research, challenging our understanding of physics and the structure of the universe.