In 2019 was taken the first photo of a blackhole: the famous blackhole M87*.
The first person to theorize the blackholes was Albert Einstein but the first person to discover the blackholes was Stephen William Hawking in 1916.
We think that a blackhole is a hole in the space but it is not exactly that.
A blackhole is a region of space where the space and the time stop. At the center of a blackhole there is a singularity (a singularity is a point infinitely small where the space-time breaks).
Around the singularity there is an illusive sphere called event horizon.
As you can see in the photo, the light can’t escape: once inside the event horizon. There’s a point in which the light orbits around the event horizon and if still more near the light, it can’t get out though it has an incredible speed.
How does a black hole origin? When a giant star creates iron in the core, it collapses into itself and the star shrinks in a point infinitely small or the singularity.