redo

Redo is the act of doing something again. As a verb, it means to perform again or to replace a previous execution of a task. As a noun, it can refer to a revision, a retrial, or the result of redoing a process, such as a redo of a drawing or a film take. Etymology: from the prefix re- meaning again, combined with do.

In everyday use, redo describes reattempting activities that did not meet requirements or preferences, or revising work.

In computing, redo is part of the undo-redo command pattern found in many software applications. A redo operation reapplies an action that was previously undone, using a stack of actions. It is commonly triggered by keyboard shortcuts (for example, Ctrl+Y or Ctrl+Shift+Z) and is essential for non-destructive editing workflows in text editors, image editors, and integrated development environments.

In data management, a redo log (or WAL in some systems) records changes to durable storage to support crash recovery. The redo log ensures that committed transactions are recoverable after a system failure, by replaying the recorded changes during restart.

In manufacturing and construction, workers may redo a task if the outcome does not meet specifications, requiring rework or revision of a component or process.