I've looked around and I can't seem to find the difference between an app.master page and .master pages. I'm building a new look and was wondering what the real difference is. I've found this resource, but I can't find any other source to back it up. It's also six years old at this point, and I want to verify this is still true.



You're on the right track. The resource you cited refers to system vs "normal" pages in SharePoint. app.master is a similar concept, used when displaying Apps. This was covered here already:


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