Audience tab

Returning against new viewers, unique viewers, how many of your viewers are subscribed, the hours they are on YouTube, age and gender, top countries and subtitle languages all sit here. Two reports get used more than the rest: the other videos your audience watches, and the other channels they watch. Between them they show where those viewers spend the rest of their time. Check which of your own uploads actually grew the audience. Then make more of those. That is how you work with a recommendation system that follows what your viewers already watch.