YouTube is one of the entertaining app over worldwide because it is free and it is very easy to use anyone can understand there are many languages for everyone there is quality is also you can watch in high, low, midium, quality. Caption also by which you can understand the story etc. There are many features like: -
1) offline.
2) subscribe.
3) watch later.
4) save video.
5) like and share.
You tube is very old and famous platform because you can get news, games, entertainment, movies, etc.