A GIF (Graphics Interchange Format) is a bitmap image format that uses a group of pictures in order to create a looping video. GIFs have become very popular and are very easy to create through websites like Giphy. GIFs are a good way to promote something in this case a band. Bands might have GIFs created of them which is audience participation which is a good audience promotion as the band doesn't have to promote themselves as the fans do it for them.
There have been websites like Vine which in a way takes inspiration from GIFs as Vine was where people could create a 7second video and post it. But as times change and technology changes Vine have said that they are discontinuing the app. Quote from Medium "Today, we are sharing the news that in the coming months we’ll be discontinuing the mobile app."