Bookmarking allows you to select a specific piece of content or playlist and save it to your bookmark tab in your profile so you can reference it easily.
What can you bookmark?
You can bookmark Content and Playlists.
How do you bookmark content and playlists?
Click the bookmark icon. You'll see it when you rollover content of playlists.
Where can you find my bookmarked content and playlists?
You'll find them in your bookmark tab on your profile page.
The content library help section shows you how to use the content library step by step.