A moderation queue refers to a place where content, like comments or posts, goes before it is approved or rejected by a moderator. It helps ensure that only appropriate content is shared or displayed. Full definition
It confuses me too when stuff goes into a moderation queue and it looks like it just disappeared (baked-in.com)
I'd post the link here, but they're getting stuck in the moderation queue. (marksdailyapple.com)
So earlier this week I received a comment in the moderation queue of my blog on my Self Publishing Is Not Hard post, where I, quite obviously, state that self publishing is not hard. (kaitnolan.com)