An infraction can be obtained by breaking one of the Minegamez Network's rules. If you want to check your infractions in-game you can do so by doing the command /infractions Doing this command will show you a list of all of your infractions, such as your, mutes, warns, bans and kicks, that you have recieved. That is of course if you've recieved an infraction from a staff member.
Receiving too many or certain infractions can lead to your Minecraft account getting permanently banned from the Minegamez Network. So make sure to read all of the Minegamez Network rules so something like this doesn't happen to you!