In astronomy, a massive object that has collapsed under its own gravity, with a gravitational pull so strong that not even light can escape, is referred to as a black hole. Black holes are formed from the remnants of massive stars after they undergo supernova explosions. They are characterized by their event horizon, the boundary beyond which nothing can escape their gravitational influence. Black holes are crucial for understanding the universe, including the formation of galaxies and the behavior of space-time.