Each atom has gravity. When two atoms come close, they start to move together. (That is, unless some other force is keeping them apart.) The larger number of atoms, the more the gravity. Meteors will tend to impact on the Earth, rather than the Moon, because the Earth has much higher gravity. By extension and similarly, when the two stars in a binary system get close enough, they almost always turn into a black hole.
Another way a black hole is created is when a star burns out and collapses.
But any sufficient amount of mass, if collected and compacted may eventually create such a deep gravitational well that there’s no way for matter that gets near to get away again.
See the URLs for the black hole creation options.
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