The best I can explain is to describe a black hole, because of the objects density it warps space, but space is not just empty nothingness, it has fundamental properties of the 3 dimensions we're familiar with but in addition to this black holes also warp time around them causing time to pass by slower the closer one gets to the event horizon. An outside observer would not experience this time dilation so years would pass for them whereas if you journeyed around a black hole potentially only hours would pass for you and this is because time is inseparable from space itself. Matter tells spacetime how to bend and spacetime tells matter how to move.