A moderator on the Art of Problem Solving website is a non-administrator user who has powers for a particular forum which non-moderators don't. That is: they can lock topics in a forum, move them, delete them, comment about certain posts and so on. The short form for moderator is mod.
Moderators vs. Administrators
Administrators are more powerful in Art of Problem Solving than moderators. Moderators are answerable to Administrators, and not vice versa.
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