What is this? Is this an Office Addin?

Hi, I'm a developer and I got this promotional e-mail from Microsoft:

I dislike the ad itself, but I'm interested the way this works: when I click in a button, instead of opening a browser, it reacts in the e-mail body itself. Like a mini browser with SPA in the body.

What is this kind of e-mail? Is it an outlook add-in? How can I create this kind of e-mail for Outlook?