Primordial black hole
Immediately after the Big Bang, when the Universe was still getting bigger, the universe was an extreme place full of subatomic particles and lots of energy. Inside this extreme place, there were places where matter was very denser than the matter around it. In these places, gravity caused these places to collapse. This gravitational collapse would have created primordial black holes. These black holes are not created when very massive stars die like with stellar black holes but we're created in the early universe.