From new dance crazes to celebrities squaring off in lip-sync battles, 2015 was a great year for YouTube.
In its annual year-in-review, the video-sharing site released lists of the top videos of the year. Categories include music videos, ads, gaming videos and top overall trending videos. YouTube compiled its lists based on the amount of time people spent watching, sharing, commenting and more. The most popular videos attracted millions upon millions of views.
Here's the full list of the top 10 trending YouTube videos this year (below). Visit the YouTube Rewind page to see top videos from the other categories.