Dropbox is a file hosting service operated by Dropbox, Inc. which uses cloud computing to enable users to store and share files and folders with others across the Internet using file synchronization.
There are both free and paid services, each with varying options; the service is cross-platform, with client programs available for several different operating systems as well as a Web-based client.
The Dropbox client enables users to drop any file into a designated folder that is then synced to the cloud and to any other of the user's computers with the Dropbox client. Files in the Dropbox folder may then be shared with other Dropbox users or accessed from the web. Users may also upload files manually through a web browser.
While Dropbox functions as a storage service, its focus is on synchronization and sharing. It supports revision history, so files deleted from the Dropbox folder may be recovered from any of the synced computers. Dropbox's version control also helps users know the history of a file they may be currently working on, enabling more than one person to edit and re-post files without complications of losing its previous form. The version history is limited to 30 days. A paid option for unlimited version history called "Pack-Rat" is available.
The version history is paired with the use of delta encoding technology. To conserve bandwidth and time, if a file in a user's Dropbox folder is changed, Dropbox only uploads the pieces of the file that ...