Black holes are termed as monsters of universe. Their gravitational pull is so strong that nothing, not even light
( electromagnetic radiation ) can escape from it. This makes it impossible for humans to see them. A black hole
is formed when a giant star collapses due to its own gravity when it had used all its hydrogen fuel and shrinks
to become a much smaller entity. this causes a lot of matter to be packed in a small space causing an immense
increase in gravitational pull.
