You use Sitefinity CMS MVC content widgets to display reusable content you have created.
You use this MVC widget to display a video on your page. You select and display a video from your website libraries.
The Sitefinity CMS Email Campaigns widgets group contains widgets that you use to display subscription and unsubscription forms to the visitors of your website.
The following tutorial demonstrates how to create a new Sitefinity CMS MVC widget in a separate assembly.