A long time ago I downloaded an app for my iPod touch (my phone was an LG Voyager at the time) to help me take attendance for the class I was long term subbing for. The app was cool at the time and is out of development now, but there was an option in the settings for that app to sync data via Dropbox. I had never heard of Dropbox before so I signed up for an account and that was that. Dropbox is now the very first app I install on a new device, I rely on Dropbox to save all of the photos and videos that my family creates, and most of the apps I rely on every day use Dropbox to function.