Blind rivets are so-called because you do not need to see or have access to the other side of the joint which is to be riveted.
Blind rivets are put into predrilled holes. When the riveting tool draws the rivet stem back sharply, the rivet is expanded to fill the hole and to form another head on the blind side. When the rivet is fully set, a further pull on the stem causes it to snap off. The noise is where the “pop” brand comes from.
The requirements for buying a rivet are quite detailed. By contrast, when you want to buy a bolt, it is a simple matter of stating the diameter, thread type and length. Or if you have a sample of what you want, you can measure this and basically ask for the size. Not so for blind rivets. They have a code system. The code which is shown here illustrates how it specifies the rivet head shape, the materials for the rivet, the stem diameter and the grip range.