Answer :
black hole is the collapsed star which was so stronger gravity field that neither light and matters can be escaped from it thats why it called as black hole .
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A black hole is an extraterrestrial object , which has enormous gravitational force. It's gravitational pull is so high that it pulls everything towards it . Not even light and tiny particles can escape from it . Two black holes can combine with each other and form a new,bigger one with more force.Black holes are one of the most probable and dangerous possibilities of how our earth,even our galaxy can get destroyed.
Scientists pose a possibility of black holes being a worm hole. A worm hole is an imaginary teleportation hole . If an object enters it , it can teleport to another place where the other end of the black hole ends.