Avoid apologies (“Sorry for the interruption”), alarm (“Warning!”), or ambiguity (“Are you sure?”)

A notable difference between OS dialogs and Material dialogs is that OS dialogs save the work when a user dismisses a dialog but Material dialogs don’t.

The difference is that a UWP pop-up dialog requires explicit action from the user as to a flyout is more peripheral and easy-to-dismiss.

Full-screen dialogs are for mobile devices only. For tablet or desktop, use a modal dialog.

Dialogs disable all app functionality when they appear, and remain on screen until confirmed, dismissed, or a required action has been taken.

A dialog is a type of modal window that appears in front of app content to provide critical information or ask for a decision

Dialogs are purposefully interruptive, so they should be used sparingly.