Artist's Rendering of a Black Hole

A black hole is essentially a region in space of extreme gravity, where no light can escape.

It's mass strongly warps space and time in the vicinity of the Event Horizon- the boundary surrounding the black hole.

Einstein's Theory of General Relativity explains that at the Event Horizon- the gravitational field of a black hole continues to infinity, and time dilation also becomes infinite.

Scientists know that black holes can form from the core of a dying star collapsing on itself under extreme gravity. Scientists also theorize that black holes can also happen naturally as matter collides under enormous pressure from all sides, squeezing and shrinking it till it stays that way forever.