Vine is a short-form video sharing service where users can share six-second-long looping video clips. The service was founded in June 2012, and American microblogging website Twitter acquired it in October 2012, just before its official launch. Users' videos are published through Vine's social network and can be shared on other services such as Facebook and Twitter. [source]
How to download videos from Vine
1. Copy a supported Vine url from your browsers address bar (see above for some examples).
2. Paste the url into the box above and click the Download button.
3. A list with several download links will appear. Each link represents a different video quality.
4. Choose a quality and click the download link.