In Minecraft, the command block is special blocks that allow commands to run, by default when a Redstone signal is emitted towards them but can be configured in many ways. This can be useful for teleporting players from them standing on a pressure plate, and some maps use that.
Select the server you would like to enable commands blocks on from the panel.
Open the file manager and select `server.properties`.
Locate and set enable-command-block= to true.
Restart then join the server.
You can now obtain and use command blocks in Minecraft with `/give <player> command_block`.