How can you reverse an action in Photoshop?

Reversing an action in Photoshop is primarily accomplished through the keyboard shortcut of Ctrl+Z (or Cmd+Z on Mac). This command allows users to quickly undo their most recent action, which is an essential feature for editing. Pressing this shortcut will revert the last modification made to the image, making it a convenient tool for correcting mistakes or trying different edits without permanently affecting the work.

Other options may seem relevant but do not effectively function as a method to reverse actions consistently. For instance, reverting to the last saved version is performed through the "Revert" option, but this resets the entire document back to its last saved state, which is not the same as simply undoing the latest action. The "Cancel" button is typically used to abort a command that is in progress, not to undo completed actions. Additionally, there is no standard "Auto-Reverse" feature in Photoshop preferences that automatically undoes actions; Photoshop's design focuses on manual control through explicit commands and shortcuts. Therefore, the shortcut provides the quickest and most efficient means to reverse actions while editing.