Why is a black hole called a black hole and what makes it different from other celestial objects?

A black hole is called a black hole because it is a region in space where gravity is so strong that nothing, not even light, can escape from it. This makes it appear black or invisible. What makes black holes different from other celestial objects is their extreme density and gravitational pull, which can distort space and time around them. This creates unique properties such as an event horizon, where anything that crosses it is pulled into the black hole.