YouTube's servers went down, making its services inaccessible to some people. Not just its website and app, embedded videos that appear on the web also went down. When accessing YouTube's server, users' browsers were greeted by a message "unable to handle this request."
The problem was more focused on regions near Europe. But presumably because users in the rest of the world are trying to access the site less because of timezone differences.
YouTube is the most popular video streaming service and one the most popular website on the web. The service rarely have problems because it's presumed largely because it is owned by Google and it benefits from the search giant's infrastructure.
