YouTube Vanced is a popular, unofficial app that offers enhanced features for YouTube users, such as ad-blocking, background playback, and the ability to play videos in higher resolutions. It provides a more customizable experience compared to the standard YouTube app. Although it isn't officially supported by Google, many users appreciate its functionalities for a smoother, uninterrupted YouTube experience. However, users should be cautious, as the app isn't available on the Google Play Store.