How To Create Private or Unlisted Channels on YouTube or Vimeo
For privacy concerns or testing and training purposes, you might not want to make videos that you post to YouTube or Vimeo public.
There are two ways to address that. You can create a private channel or an unlisted channel. thebasicgist explains the difference between public, private and unlisted. San Antonio YouTubers offers a more detailed tutorial for YouTube. Here are instructions for Vimeo.