A black room is a room or a space that is completely dark. It's like being inside a really big, empty closet or box.
Imagine you are in a room where there is absolutely no light. You can't see anything, not even your feet or hands. The darkness is so deep that you almost feel like you're floating in space.
It's like when you close your eyes, but even darker. When you close your eyes, you can still see some colors and shapes, but in a black room, you can't see anything at all.
A black room can be used for many different things like for experiments, photography or meditation. It helps people to focus on their other senses like hearing or touching because they can't rely on their sight.
Overall, a black room is a very special and unique place where you can experience absolute darkness.