SCADA/ICS systems are frequently used within critical infrastructure to control and read data in industrial processing. These systems are generally not designed with security in mind; rather, they are simply designed to work and to last.
More and more, however, these systems are being connected to internal networks and (indirectly) to the internet. This carries a number of risks. Disruption of SCADA/ICS systems can impact the physical world. Locks open, power plants cease operation, or water treatments suddenly become unreliable.