file mirroring&One-click hosting

In 2007, a new type of file hosting site emerged known as a file mirror or file spreading engine. These services allow users to upload their file to the hosting servers. The user's file is then distributed to multiple web hosts without using the user's bandwidth. For more information, see Mirror (computing).
One-click hosting
One-click hosting generally describes web services that allow internet users to easily upload one or more files from their hard drives (or from a remote location) onto the one-click host's server free of charge.
Most such services simply return a URL which can be given to other people, who can then fetch the file later on. As of 2005 these sites have drastically increased in popularity, and subsequently, many of the smaller, less efficient sites have failed. Many internet forums exist in order to share such links; this type of file sharing has, to a degree, taken over from P2P filesharing services.
The sites make money through advertising or charging for premium services such as increased downloading capacity, removing any wait restrictions the site may have or prolonging how long uploaded files remain on the site. Many sites implement a CAPTCHA to prevent automated downloading.