Photos and Albums - Why both?

I'm replacing my Dolphin site with Una and a bit confused with the Albums and Photos separation on Una. If I have the Albums app active, I really don't see why I would activate the Photos app as well. I'm trying to keep it simple for my users and if they can post photos in albums, I'm not sure why to complicate it by allowing posting of photos alone as well. On other hand, I might be missing something here. Is it beneficial on a social network-type site to use both? For those that have both active, how do you imagine that site members will use these two separately?