Redo Models
Redo reverts the effects of the undo action. The simplest form of redo is flip-undo, in which using undo after undoing redoes the undone action. In this case, the program flips back and forth between two states when the undo button is pressed.
In a more typical redo model, there are separate undo and redo buttons. The redo can be used for each undo action performed. Making a new edit usually clears the redo list. If a branching redo model is used, the new edit branches the action history.
Read more about this topic: Undo
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