MCBans is a global banning solution for Minecraft, provided through the Bukkit plugin. The aim of the plugin is to provide server owners and staff with a method of assisting in the prevention of griefers on their servers and others that run the MCBans plugin.
There are various ban reasons on Vox Populi. To prevent being banned players are adviced to read and follow the Rules. In many cases players receive 1-5 warnings before they are banned, but it is upon the staff to decide the severity of each case.
If a player is banned, (i.e. for breaking a honeypot block), they may create a ban appeal post on the forums.