Help:Page validation

Pages can be protected in accordance with our protection policy, and there are several forms of protection: full protection, 30/500 protection, semi-protection, and pending changes protection (PCP). A page that is protected under PCP must have its edits approved by someone in the pending changes reviewer user group before being shown to readers. Note that the edits are still made and added to the page history and Special:Contributions, and are shown to logged-in editors by default, but will not be shown for logged-out editors and readers prior to approval.

Difference between moderation and page validation
LifeWiki also has a moderation system which requires all edits made by unregistered users to be approved prior to being published. This is a separate process from page validation, because moderation hides edits from all users prior to being approved; not just readers. Also, moderation is mainly for preventing vandalism, unlike page validation, which is for quality control; more to ensure that the edits made are high quality, and as such edits that are rejected by page validation are encouraged to be improved to allow them to be published, whereas edits that are declined in the moderation process are considered to be permanently discarded.