What are the Three Types of Black Holes?

The three types of black holes are, stellar, supermassive, and miniature. A stellar black hole occurs when the outer layers of a star explode and the inner region implodes. A supermassive black hole is huge, and may be caused by a group of stars collapsing. There has been no evidence of miniature black holes existing, but astronomers still believe that they do. For more information see here: