Review Link is a public link that you can share with anybody in your organisation.
They will then be able to watch the video and provide comments on it, you will get a notification each time a use submit a comment (You can turn this off in your settings).
User will be able to download the video from this link as well if allowed (by default off), you can also give a password protection on the review link (none by default).
How to get the review link
Go to your project dashboard and click “Review” on a video that was previously uploaded, then you will find the link on the top right part of the window:
How to change the settings of the review link
From the video page right here: