Dropbox allows users to create a special folder on their computers, which Dropbox then synchronizes so that it appears to be the same folder (with the same contents) regardless of which device is used to view it. Files placed in this folder are also accessible via the Dropbox website and mobile apps. Dropbox uses a freemium business model, wherein users are offered a free account with a set storage size and paid subscriptions for accounts with more capacity.
Dropbox was founded in 2007 by MIT students Drew Houston and Arash Ferdowsi, as a startup company from the American seed accelerator Y Combinator. Dropbox provides client software for the OS systems Linux, OS X, and Windows NT; for the mobile systems Android, BlackBerry OS, iOS, and Windows Phone; and for web browsers; as well as unofficial ports to MeeGo and Symbian.
Dropbox consists of cloud-based services for user identity and management, data storage, access, management, and programmatic interfaces (APIs); clients for data access and storage on desktop and mobile operating systems; and web applications for data and service management.
The Dropbox client enables users to drop any file into a designated folder. The file is then automatically uploaded to Dropbox's cloud-based service and made available to any other of the user's computers and devices that also have the Dropbox client installed. Users may also upload files manually through the Dropbox web application.