Although the term "Black Hole" wasn't coined until 1967 by John Wheeler, a physicist from Princeton University, Einstein scientifically predicted the formation of black holes in 1916 with his General Theory of Reletivity. Einstein's discovery was revolutionary to the way we think of space today. Capable of possessing infinite gravity, stopping time, and even destroying space itself, black holes are a singularity point in which nothing can escape. They form when a massive star dies and collapses in on itself. But don't worry, our Sun is far too small to become a black hole.
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