A linear actuator is a device that turns energy into motion along a straight line. Instead of spinning like a motor shaft, it pushes or pulls a load forward and back. Linear actuators appear in robots, valves, locks, industrial machines, cameras, and adjustable mechanisms where precise positioning matters. In walking robots, they are one way to create leg motion and body support in a compact form.
In cyber security, linear actuators matter because they are the physical endpoint of a control system. If an attacker compromises the software, firmware, PLC, or network commands that drive the actuator, they may force unwanted movement, stop a safety-critical motion, or overload a mechanism. Defenders protect these systems with authenticated commands, limit checks, emergency stops, and monitoring for abnormal actuator behavior. The actuator itself is simple; the security risk comes from what can command it.