Redos

Redos are repeated attempts to perform an action or to revise a result. The term is used across various contexts to describe redoing something after a prior attempt, a reversal, or an undo.

In computing and software, redo refers to reapplying actions that were previously undone. It is a companion to the undo operation in many applications, allowing users to re-execute a canceled step. Redo history is typically stored in a stack and can be navigated multiple times, though performing a new action after undoing often clears the redo stack. Common keyboard shortcuts for redo vary by platform and program, but Windows apps often use Ctrl+Y or Ctrl+Shift+Z, while macOS apps frequently use Command+Shift+Z.

In education and assessments, a redo (or retake) describes the opportunity to attempt an exam, assignment, or assessment again, sometimes under different conditions or with revised content. Institutions set policies on eligibility, timing, and impact on grades.

In production and editing, redos can refer to revisions or reshoots of creative work. A director might order a redo of a scene, or a designer may update a prototype after feedback.

Etymology-wise, redo is formed from re- (again) and do, dating from English usage in the early modern period. The plural redos is used when discussing multiple instances of redoing something.

See also: undo, redo stack, revision, retake, reshoot.