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Micro black holes, also known as quantum mechanical black holes, are theoretical and would have very small masses and evaporate quickly through Hawking radiation. They are postulated to possibly be produced in high-energy particle collisions, such as those that occur in the Large Hadron Collider.

A stellar black hole is formed when a massive star collapses under its own gravity after a supernova explosion. They typically have masses between about 5 and 20 times that of the Sun. The first detection of a stellar black hole was in 1971 with Cygnus X-1.

A supermassive black hole has a mass of millions to billions of solar masses and is usually found at the center of galaxies, including the Milky Way's Sagittarius A*. These black holes have such strong gravitational pulls that they affect the orbits of stars and can be detected indirectly.

Primordial black holes are hypothetical and would have formed soon after the Big Bang, not from collapsing stars but from high-density regions in the early universe. They could have any mass, with some theories suggesting they might make up dark matter. However, there is no empirical evidence for their existence.