Question

What do you mean by undo and redo?

Answer 1

Redo is a function performed on a computer that does any undo function again. For example, if you deleted text and perform an undo, then decide that you wanted that text deleted again, you could do a redo. Tip: On the PC the shortcut key to redo is usually Ctrl+Y or Cmd+Y.

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Answer 2

undo means undone command and redo means redone the command