The theory of black holes suggests that these astronomical objects form when massive stars collapse under their own gravity after exhausting their nuclear fuel. The gravitational pull of a black hole is so strong that nothing, not even light, can escape from it, making them invisible and detectable only through their interactions with surrounding matter. Black holes are characterized by their event horizon, the boundary beyond which nothing can return. The study of black holes is closely related to the theories of general relativity proposed by Albert Einstein and has led to significant advancements in our understanding of space, time, and the fundamental laws of physics.