Dtube is an open source video sharing site similar to YouTube, which is easy to use. People can log in to dtube with steemit information, upload and watch videos.
When you are walking on Dtube, you come across a channel, the channel trailer is very important to learn more about what that channel is about. People can enter the channel on this number and have ideas about what they are and what kind of content they produce.
Thus, many Dtube users can subscribe to any channel after logging in any channel, and they can be a strict follower of this channel and have an idea about this channel through the trailer (short video).
