This article is about Minecraft server operators. You may be looking for wiki sysops.
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In terms of Minecraft, an operator (or op for short) is a user who has been granted acces to all console commands on a Minecraft server. On a standard server op status can only be given or revoked by the server console or another op, using the /op <user> and /deop <user> commands.

Customized servers may have different definitions of who is an operator and what they can do. Some also have differently named or additional ranks, such as administrators. Detailed information on a server's ranks can usually be found on their website or near the spawn point.