From the Dropbox website: Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily. Never email yourself a file again!
Dropbox is another one of those super-popular programs out there today. What makes it popular, it serves a real need for most of us. It is a great way to back up files to the cloud and to share files. You can share files with yourself, between home and work for example, or between you and whoever else you choose to share files with. Share from your work computer to your home computer to your phone… Synchronization is automatic and it is a very efficent program!
Check out the very basic video explaining Dropbox at the download link below.
Download it at: http://www.dropbox.com/