According to Wikipedia:
Vine is a mobile app owned by Twitter that enables its users to create and post short video clips. The service was introduced with a maximum clip length of six seconds and can be shared or embedded on social networking services such as Twitter (which acquired the app in October 2012) and Facebook. Though Vine was initially available only for iOS devices, it has been introduced on Android, Windows Phone, HTML5, and Windows 8.
A Vine is a 6-second video, usually made for Twitter. But the popularity of Vines is spreading to other social networks, and the length of a Vine, though officially 6 seconds long, is unofficially somewhere between 5 and 10 seconds. Vine is the app that lets you do this, both record and share the video, with your smartphone.
The video above is a compilation of Vines made by Los Angeles-based video artist Zach King. Call them what you will; special effects, illusions, or magic, this compilation of Vine tricks is well worth wasting a few minutes on. Watch as King pulls kittens from computers, jumps through closet walls, and chases his computer mouse when it changes into a real mouse, plus dozens of other tricks. You’ll be amazed!