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In Sitecore content authors have the ability to make a piece of content versionable. Each version of an item begins as a replica of the original or of another version and are all stored in Sitecore. Previous versions operate individually and can be published as the active version of a content item instead of the most recent version. At any time an active version can be rolled-back to a previous version and vice versa. Individual versions can be scheduled to publish at different dates/times in the future. A publishing agent needs to be running in order to handle scheduled version publishing. Speak to your Sitecore Administrator to learn more about your site’s unique publishing process.