Everything that is massive pulls stuff towards it. The earth is massive, so people don’t float, but they are pulled to the surface instead by the gravitational pull.
Now, imagine something much more massive than the earth or sun. An object like that would not only pull humans, but also mich smaller and much bigger objects in quite some distance.
A black hole is so massive that it even pulls the light with its gravitational pull. So light is not reflected (and then seen by us), but it ‘stays’ there, because the pull is so strong. No reflection is seen by our eyes as black, hence a black hole.
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