Vloggers are YouTubers that make blogs for their YouTube channels. The word "vlog" is a mix of "video" and "blog". This kind of activity takes up a majority of YouTube, as it is the easiest to do. Most Gaming YouTubers have vlog channels to show what their outside life is like; however, sometimes it is the other way around. McJuggerNuggets and JoeyGraceffa, for example, do vlogging for a living, and have a second channel, which is related to gaming.
The category of vlogging is People & Blogs.