What is a vine?

Answer 1

Funny videos people had made.

More specifically, a vine is any video posted on the social media app Vine (short for "vignette"), which only allows videos of up to 6.6 seconds in length. This forces the content creators to use the available time wisely and find out how to make a lasting impression on someone in under seven seconds. It is quite an enjoyable challenge, and many Vine users have been able to be very successful in social media.

Answer 2

A vine is a climbing or trailing woody-stemmed plant, such as a grape vine or briar vine.

In slang, it can mean a very short video (5-10 seconds) of random stuff.