The youtube is a web platform, see Wikipedia YouTube, where you can watch videos that are made by YouTubers or users. There are so many videos on this web platform.
These videos are sorted by different categories, see these examples:
-vlogs: https://www.youtube.com/watch?v=yJB0P9YgPj0;
-draw my life: https://www.youtube.com/watch?v=mXO44v7N70E;
-crazy: https://www.youtube.com/watch?v=X3OCbH-JKBM;
-games: https://www.youtube.com/watch?v=RSqU3NX-A_s;
-tutorials: https://www.youtube.com/watch?v=S04_GgNz4R8;
In this world, you can have a job but YouTube is a hobby where you can win money. You need subscribers to win money and have a title on these platforms. PewDiePie has 100 million subscribers. He makes everything on his channel. He is an American YouTuber and he makes games, vlogs and etc.
For example, Popularmmos is a popular Youtuber and an English or American YouTuber. He made and makes Minecraft videos.
IHATEPINKTF is a Romanian YouTuber. He is a friend of MaxTheInfinite and Carlos. MAXinfinite is a popular Romanian YouTuber, but Carlos isn’t a YouTuber. MAXinfinite has 2 million subscribers and PINK has 1 million subscribers.