Dropbox is an easy-to-use cloud storage and file sharing service that makes it simple to store, access, and share your files from anywhere. With Dropbox, you can store all your important files in one secure place, share
From Wikipedia
Dropbox is a file hosting service operated by the American company Dropbox, Inc., headquartered in San Francisco, California, that offers cloud storage, file synchronization, personal cloud, and client software. Dropbox was founded in 2007 by MIT students Drew Houston and Arash Ferdowsi as a startup company, with initial funding from seed accelerator Y Combinator.