Very first, modded YouTube app with Ad Blocking feature.
YouTube Vanced is a new modded version of YouTube which contains a lot of features like Ad Blocking, Background Playback and many more.
YouTube Vanced Features
Features are same in all versions. There is only a slight difference in the Non-Root version since the package name had to change, Google Play Services will not play alone until you have to be compelled to install MicroG for Vanced, in order to be able to log in.
Background Playback
Force VP9 (or HDR) or vice versa
Override Maximal Resolution
Pinch to Zoom (for all devices)
Casting Togglable (can be forced off)
Toggle Themes (Black, Dark, White)
PiP - Picture in Picture mode (Oreo only)
Auto Repeat Feature
Preferred Speed and Resolution