SPACE TIME CURVATURE
when large objects are appeared in space it will be curved because of mass of that object.
anything with mass-including your body- the space will be bend. and the warp or bend depend on its mass. a small  object  with huge mass creates a more  bend  than a large object with a small mass.
depth of the warp means the strength of the gravity.
theory of relativity predicts that a  sufficient compact mass deform space time to form black hole. black holes have more gravity as well as huge mass. as far as black hole conserned have great gravity. particle or even electromagnetic radiation such as light can't escape from it.
our sun created a space time curvature, our  planets including earth in which we live revolving around the sun because of that curve (as well as moons around it's mother planets)
i will show you through an experiment:
:-)we can concider a plane sheet, and we put something that have some mass. can you guess what will happen? yes it will make a warp or bend.