If a photographic print is 'archival' it's constructed from materials that are appropriate for a museum exhibition. Only certain types of printing processes and paper qualify, and the prints must be mounted on acid-free material.
The advantage is that if properly cared for archival prints should remain in perfect condition for anywhere from eighty to three hundred years. Standard prints can begin to fade in as little as three or four!!
All my prints, of course, are made to archival standards.
