Once a giant star dies and a black hole has formed, all its mass is squeezed into a single point. At this point, both space and time stop.The point at the center of a black hole is called a singularity. Within a certain distance of the singularity, the gravitational pull is so strong that nothing–not even light–can escape. That distance is called the event horizon. The event horizon is not a physical boundary but the point-of-no-return for anything that crosses it. When people talk about the size of a black hole, they are referring to the size of the event horizon. The more mass the singularity has, the larger the event horizon.
As you read before there are layers for a black hole. black holes have 3 layers, the outer event horizon, the inner event horizon and the singularity. The outer event horizon is gravitational pull strong enough to trap light and any other thing in space. The inner event horizon is sometimes called "the point of no return" because if anything gets in it there is no getting out. The point at the center of a black hole is called a singularity. The singularity is the center of the black hole also called the point singularity. The point singularity is the part of the black hole that freezes time. When something gets in it the objects time stops. So if you get to go inside of it time will freeze, but by then you will be already dead because of a very strong gravitational force.
The types of black holes
There are three different types of black holes. stellar, supermassive and miniature black holes are all the types of black holes. Stellar black holes form when a massive star collapses. Supermassive black holes, which can have a mass equivalent to billions of suns, likely exist in the centers of most galaxies, including our own galaxy, the Milky Way. No one has ever discovered a miniature black hole, which would have a mass much smaller than that of our Sun. But it's possible that miniature black holes could have formed shortly after the "Big Bang," which is thought to have started the universe 13.7 billion years ago.