Embed blocks allow you to insert third-party content (video, audio, images, tweets, etc.) to your WordPress site. Here are some examples.
WorkingHandsFree.org
WorkingHandsFree.org is a site dedicated to teaching injured people how to work on their computer hands-free. This includes people with repetitive strain injuries (RSI), tennis elbow and golfer's elbow, carpal tunnel, or any other hand, wrist, elbow, or arm injuries/disabilities that limit movement of the arms.
WorkingHandsFree.org 