Dropbox is a cloud storage service that allows users to store and share files securely online. With Dropbox, users can access their files from any device, anywhere in the world. Dropbox also offers a variety of collaboration tools, such as shared folders and real-time document editing, to help teams
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.