help:mod_queue
The moderation queue (usually referred to as the "modqueue") is a system used to filter out images that do not meet Danbooru's quality standards.
All posts by non-Contributors start out as status:pending|pending and go through the modqueue. "Approvers":[/users?search%5Blevel%5D=>=37] look through the queue and approve posts that meet Danbooru's standards. Posts that aren't approved within three days are status:deleted|deleted.
Contributor-level users have their posts automatically approved, bypassing the modqueue. You may be granted this privilege by consistently uploading high-quality posts while maintaining a low deletion ratio. The general criteria for Contributor level are having 500-750 uploads and having a recent deletion ratio of around 5% or lower, though users with very few deleted posts might be promoted at lower thresholds.
If a post is deleted, and you think it deserves a second chance, you can appeal it. See howto:appeal for details. You can also ask for feedback in the "Upload Feedback Thread":[/forum_topics/7934]. On the other hand, if you think a post is poor quality and shouldn't have been approved, you may flag it to return it to the modqueue. See howto:flag for details.
You can view the posts currently in the modqueue by searching status:modqueue. Approvers may use status:unmoderated outside the modqueue interface to see the pending posts they haven't made a decision on.