Dropbox is a service that lets you access your stored data from virtually anywhere. Think of it as a USB Stick/key in the sky. Data you select from your computer is synchronized to the Dropbox servers and from there you can access it from virtually any Internet connected device. You can share files with others, display pictures and much more.
Dropbox is a highly recommended service to help you use the Internet to protect your data and have access to it when away from home base. Check it out at http://dropbox.com .