YouTube playlists make it easy for viewers to watch a collection of pre-selected videos. Normally, playlists are created while logged into YouTube and are saved under an account.
But... there's also a way to create an anonymous playlist on-the-fly!
Why would you want to do this? Let's say you're helping a patron find information and there are some relevant videos on YouTube. You can stitch these together as a playlist and send the patron a single link!
Here's an example (using mostly cat videos, of course!):
Cat video 1: https://www.youtube.com/watch?v=G4Sn91t1V4g
Cat video 2: https://www.youtube.com/watch?v=3yNSF7ljOoU
Cat video 3: https://www.youtube.com/watch?v=0M7ibPk37_U
Cat video 4: https://www.youtube.com/watch?v=OUtn3pvWmpg
Craig's very suspenseful woodchuck video:
Take this base URL:
and glue the video IDs separated by commas
onto the end.
The resulting URL (which wraps because it is so very long):
takes you to an Untitled Playlist containing all 5 videos.