The Content Moderation module allows you to expand on Drupal's "unpublished" and "published" states for content. It allows you to have a published version that is live, but have a separate working copy that is undergoing review before it is published. This is achieved by using <a href=":workflows">Workflows</a> to apply different states and transitions to entities as needed. For more information, see the <a href=":content_moderation">online documentation for the Content Moderation module</a>.