Undo option is used to reverse the last action, that can also be done using the keyboard shortcut 'Ctrl + Z' or using the
menu bar option 'Edit -> Undo'. Repeat or redo option is used to repeat or redo the same action performed previously by using the
menu bar option 'Edit -> Repeat'. Undo and Repeat Action in Microsoft Powerpoint 2002
In the example,'Undo' option is used to undo the previous typing action.
'Repeat' or redo option is used to repeat the typing.