It's common for a sighted person to wonder what blind people see or for a blind person to wonder whether the experience is the same for others without sight. More than 250 million people in the world are blind or visually impaired in some way.
A person who is born blind has dreams, but doesn't see images. Dreams could include sounds, tactile information, odors, flavors, and feelings. On the other hand, if a person has sight and then loses it, dreams may include images. The appearance of objects in dreams depends on the type and history of blindness. Mostly, the vision in dreams is comparable to the range of vision the person has had throughout life. For example, someone who has color blindness won't suddenly see new colors while dreaming.

Complete blindness is incredibly rare. This happens when the connection between the eyes and brain is completely cut off, either there is brain damage, the optic nerve has been severed, or the eyes have been removed. This doesn’t mean that people in these cases see black. They see nothing.

Partially Sighted
What about the majority of blind people, who have at least some sight? Well, that depends entirely on A, what level of vision the person has, and B, what is causing the loss of vision.