Cyber-Physical Systems Security are engineered systems that are built from, and depend upon, the seamless integration of computation, and physical components. While automatic control systems like the steam governor have existed for several centuries, it is only in the past decades that the automation of physical infrastructures like the power grid, water systems, or chemical reactions have migrated from analogue controls to embedded computer-based control, often communicating through computer-based networks. We speak with CyBOK Cyber-Physical Systems Security author Alvaro Cardenas for an introductory overview of the topic.