Pending changes protection is a tool used to suppress vandalism and certain other recurrent nuisances on Wikipedia while allowing a good-faith user to submit an edit for review. Intended for infrequently edited articles that are experiencing high levels of such troublesome edits from new or unregistered users, pending changes protection can be used as an alternative to semi-protection and full protection to allow unregistered and new users to edit pages while keeping the edits hidden to most readers until they are accepted by a pending changes reviewer (also called a "reviewer"). There are relatively few articles on Wikipedia with this type of protection.
When a page under pending changes protection is edited by an unregistered editor (also called an "IP editor") or a new user account, the edit is not directly visible to the majority of Wikipedia readers until it is reviewed and accepted by an editor with the pending changes reviewer right.
Pending changes are visible in the page history, where they are marked as "pending review". The latest accepted revision is displayed to the general public, while logged-in users see the latest revision of the page with all changes applied. When editors who are not reviewers make changes to an article with unreviewed pending changes, their edits are also marked as "pending review" and are not visible to most readers until they are reviewed.
Both logged-in users and unregistered users who click the "edit this page" tab edit the latest revision as usual. If there are pending changes awaiting review, there will be a dropdown box next to the article title pointing to the pending changes.