A Drawer is a panel that is typically overlaid on top of a page and slides in from the side. It contains a set of information or actions. Since that user can interact with the Drawer without leaving the current page, tasks can be achieved more efficient within the same context.
* Use a Form to create or edit a set of information.
* Processing subtasks. When subtasks are too heavy for Popover and we still want to keep the subtasks in the context of the main task, Drawer comes very handy.