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Dropbox is a cloud-based file hosting service started by Dropbox Inc. It offers cloud storage and file synchronization. Dropbox allows users to create a folder on their desktops and then Dropbox will synchronize the folder with the user's Dropbox folders on the cloud server. Dropbox uses a freemium model. A fixed amount of storage space is given to users. More space is obtained through paid subscriptions. The app is available for the web browser, desktop and mobile platforms.