YouTube Vanced is a popular modded version of YouTube. It adds a number of features to the official YouTube app, including built-in adblocking, background playback, black/dark themes, and much more. This page has installation instructions and download links for non-rooted devices. YouTube Vanced for rooted devices can be found here.
The YouTube Vanced team has created a new, easier method for getting Vanced up and running. Users can now simply install the Vanced Manager app