Space can curve.
Space curves into massive objects, so anything going in a straight line will seem to bend toward that object. You can think of light as a car going in a straight line… but the road is banked, so the car driving straight will seem to turn with the road even though its wheels are straight.
A black hole is so massive that the curvature of space near it is like a road banked to the extreme. Any light going outward from the black hole will just bend back in because of that extreme curvature.
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