Channels are one of the coolest parts of YouTube, that provides quick access to all videos. YouTube channel is a spotlight for uploading video, comment, or to make playlist. However, without YouTube channel you have no public presence. YouTube channel is like a homepage, where user can organize the videos or arrange the playlist. User can customize their channel with logos, graphics, pictures and text description.
With help of Google Account, you can watch the videos and subscribe the channels. However, without a YouTube channel, you have no public presence on YouTube. Even if you have a Google Account, for upload videos, comment, or make playlists you need to create YouTube channel. You can create your channel on either the YouTube mobile site or YouTube website.