What is a theoretical massive object whose gravitational field is so intense that no electromagnetic radiation can escape?

A black hole is defined as a theoretical massive object that has a gravitational field so strong that nothing, not even light, can escape from it. This intense gravitational pull occurs because a significant amount of mass is concentrated in a very small volume, typically resulting from the collapse of a massive star at the end of its life cycle. The boundary surrounding a black hole is known as the event horizon; once anything crosses this boundary, it cannot escape the gravitational force. This characteristic distinguishes black holes from other astronomical objects, as they are undetectable directly through electromagnetic radiation like optical light, infrared, or radio waves. Instead, they can be inferred by observing the effects they have on nearby matter or light, such as the acceleration of stars orbiting around them or the emission of X-rays from material falling into them. This unique nature of black holes emphasizes their role as extreme entities in the universe.