To undo an action on a keyboard, the standard shortcut is Ctrl + Z on Windows and most applications. This command reverses the last change you made, and you can press it repeatedly to undo multiple steps if the program supports it

. Additional details:

• On some Windows apps, Alt + Backspace can also perform Undo

• To redo an undone action, the common shortcut is Ctrl + Y or sometimes Ctrl + Shift + Z or F4

• Undo is often available via an Undo button or menu option in the software interface, typically represented by a curved arrow pointing left

• Some actions cannot be undone, such as certain commands in the File menu or saving a file

In summary, the primary keyboard shortcut to undo is:

• Ctrl + Z (Windows and most programs)

For Mac users, the equivalent is usually Command + Z (not covered in the search results but widely known). This shortcut works across many applications including Microsoft Office, text editors, graphic software, and more