Unlisted Gallery link will provide your visitor access to:
Public albums
Limited, anyone with the link album
Limited album (if you shared that album with them earlier)
Public Gallery link will provide your visitor access to:
ONLY your public albums
Tutorials
Visibility and Sharing
Unlisted Gallery link will provide your visitor access to:
Public albums
Limited, anyone with the link album
Limited album (if you shared that album with them earlier)
Public Gallery link will provide your visitor access to:
ONLY your public albums
Limited refers to sharing with circles on Google+
Unlisted Gallery link will provide your visitor access to:
Public albums
Limited, anyone with the link album
Limited album (if you shared that album with them earlier)
Public Gallery link will provide your visitor access to:
ONLY your public albums
Unfiltered