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Black holes are a infinite hole that not even light can escape its gravity.  Black holes are created when a star reaches critical mass and collapses on itself. This compresses all the matter into a certain volume which turns it into a black hole.

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The answer involves the gravity and the internal pressure within the star. These two things oppose each other -- the gravitational force of the star acting on a chunk of matter at the star's surface will want to cause that matter to fall inward, but the internal pressure of the star, acting outward at the surface, will want to cause the matter to fly outward.

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You can see some of the fireworks going on near a black hole. As gas falls into a black hole (perhaps coming from a nearby star), the gas will heat up and glow, becoming visible. Typically, not only visible light, but also more energetic photons like X-rays will be emitted by the gas. What we would expect to see (if our telescopes could "zoom-in" enough) would be a glowing rotating disk of material, with the black hole down a the center of the disk

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There is no limit to how large a black hole can be. However, the largest black holes we think are in existence are at the centers of many galaxies, and have masses equivalent to about a billion suns.

There is no lower limit to the size of a black hole. But, a full theory of how gravity works must also include quantum mechanics, and such a theory has yet to be constructed.

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http://www1.phys.vt.edu/~jhs/faq/blackholes.html
https://www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-a-black-hole-k4.html
https://www.thoughtco.com/black-holes-information-3072388