Automatically Switching to a redundant or Standby Server, SyStem, or network upon the failure or abnormal termination of the currently-active Server, SyStem, or network (a "hot Standby" or "warm Standby"). Failover happenS without human intervention. ThiS feature iS uSually built-in to expenSive SyStemS which muSt be available continuouSly. (2001-03-19)