A black hole is a region in space where gravitational force is so strong that nothing could ever escape from it. As black holes traps light they are invisible. It is called a hole because nothing can ever come out of it. Light or other electromagnetic radiation can never escape out it. Therefore it is called a black hole. The term ‘black hole’ was given by John Archibald Wheeler. Before that these objects were referred to as ‘frozen stars’.
The fundamental explanations of these black holes are based on the equations in the theory of general relativity developed by the German physicist Albert Einstein, which was published in 1916. These black holes are so dense that not even light can escape its gravitational effect. Nothing could travel faster than light. Therefore nothing can escape from inside a black hole.
Even before Isaac Newton’s time, scientists speculated that such things could exist. But now they are accurately described using General Theory of Relativity proposed by Einstein. This brings us to the conclusion that block holes are nothing but fascinating objects in space where space and time, both become so warped that even time practically stops in the vicinity of a black hole