What is the black hole in space?

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. This makes them invisible and difficult to detect directly. They are formed when a massive star collapses in on itself, creating a singularity with infinite density and a gravitational pull that distorts space and time around it. Black holes can vary in size, with some being as small as a single atom and others being millions or even billions of times more massive than our sun.