As you aware that you can use Office and SharePoint Add-ins to extend Office applications with content directly from the web or to extend SharePoint websites. But do you know the “new name” for “apps for Office and SharePoint”? Yes, the platform name will be changed from "apps for Office and SharePoint" to "Office and SharePoint Add-ins". Currently the related products, documentation, samples, and other resources are getting updated to reflect the change – so that this change will help better distinguish the extension platform from Office Add-ins (applications). The following table lists the names that are changing and the new names:
In Office Developer tools for Visual Studio (Office Web apps, VSTO, COM add-ins) it will be further differentiated as the following:
Hope this helps.