Blindness is actually a spectrum. I always assumed it was an all-or-nothing kind of situation but it's really not. There are different ways for someone to lose their vision, all of which result in different remaining vision, or none remaining. Even people with the same circumstance might have different vision. Some people may have lost all of their vision, some might be able to detect light or shadows, some can still make out blurs/colors and there are even more.

Personally,it's mostly blurs and colors. My depth perception is also shot. Just recently I thought I was handed a pepto tablet since it looked pink. Turns out it was a red and white spiral peppermint that was just super blurry to me.

If you're asking what it's like to not see at all, someone once described it as seeing out of your elbow. You just don't see.

I've been blind in my left eye and half blind in the other for my entire life. No depth perception, which is fine because
I don't know what it's like either way. Bill Nye said people with no depth perception see the world as flat, but I don't think that's true. I see 3D nicely.
I only see one side of my nose and if you cover both my eyes I see black in my right eye because it has sight and no difference in my left. I don't see light, shadows, blurs, nothing in my left eye. It's basically dead.
And it's like this:
Hold your finger above your eyebrows. Can you see it? No? Why not? Because your eyesight is cut-off. It's simply not there.
So for my left eye, there's no black, there's nothing. It's just cut off from my right.

Fun fact : As for looking around and talking to people, I always have my face tilted away from them because I use my right eye's central vision to look at people. It's always a surprise when I look at myself in photos to see my face tilted to the side when I was looking straight at the camera.

In my left eye, which lost its sight when I was around 4, I have plausible hallucinations as if I could still see. In my right eye I still have some light perception which is mixed with hallucinations of seeing lights.

If you lost the ability to see so much that all you see is black. How would an individual like that be able to read this question?