What key combination is used to undo the last action?

The key combination used to undo the last action is Ctrl + Z. This command is widely recognized across many software applications, including word processors, spreadsheets, and graphic design programs, making it a standard part of computer operation. When a user makes a mistake or wishes to revert to a previous state, pressing Ctrl + Z allows them to quickly reverse the most recent action, thereby providing an efficient way to make corrections without the need for more complicated steps.

This functionality is crucial for enhancing productivity and reducing frustration, as it enables users to easily manage their work without the risk of losing significant progress due to minor errors.