Dropbox is a cloud program for saving documents, photos, and files so that they will be available on any device when you need them. I use Icloud for most of my cloud saving, but if I need to get something off a windows desktop I will have to log in on icloud over the web and sometimes there are file compatability issues. With Dropbox, I can drop something in my box and have it available on any device. I still have the free account and it is large enough for my needs.