What is the horizon of a black hole

Is it a point of no return or is it a surface packed densely with material "bits". Can both be correct?

The event horizon of a black hole was thought to be the area of no return. If anything passes the event horizon, it would be impossible for it to escape the black hole, and it would fall in with 100% certainty.

These days, scientists are not so sure. Quantum gravity is needed to describe what happens in a black hole, because the extreme conditions evade the laws of physics. Superstring theory is considered as a viable theory, but here, the event horizon is not a clear-cut membrane, but a tangled knot of strings.

A black hole itself is an area of completely void space surrounding a singularity. The event horizon is not a physical barrier.

I find it amazing that you can't get a decent of something so simple. The Event Horizon of Black Hole is the spherical area in which light no long can escape though theoretically light may still be able to orbit around the black hole at if it stayed at The Event Horizon but inside The Event Horizon light would be pulled in. Relativistically it's where time is still; just like moving at the the speed of light. Just before The Event Horizon time ticks slowly; though no can tell us of what lies inside, if continues this symmetry, time should go backward inside The Event Horizon. If you have even a basic knowledge of relativity this should give a better sense of what an Event Horizon is.

There is nothing special physically about the event horizon. From your perspective, nothing out of the ordinary occurs as you pass through it (aside from increased tidal forces). However, an outside observer will never actually see you pass through. So as observers on Earth, we will never observe anything crossing through the event horizon. Therefore from our perspective, the entire mass of the black hole is just outside it.

It is the boundary around a black hole where the escape velocity reaches the speed of light.

Escape Velocity is the velocity required to break free from the gravitational pull of an object. The closer you get to an object the more you come under it's influence of gravity.

I thought it was the point of no return, from my understanding.