Is Microsoft Whiteboard an add-in or a service?

I'm a developer. Someone know exactly what Microsoft Whiteboard is? Is it an add-in or a service?

Eg.: ref to Admin Center Microsoft Office 365, menu Settings > Services & Add-in > Whiteboard

Is it possible to interact with Microsoft Whiteboard through an add-in? Is office-js able to make this link for we create an add-in to Microsoft Whiteboard?

Or, is it possible for we incorporate the Microsoft Whiteboard into our app/webpage like an "extension" of our web/app? The target would be create and link a Whiteboard for embedded use.

Any tip is welcomed. Thanks since now.