+A **PID controller** (proportional–integral–derivative controller) is a ubiquitous feedback loop mechanism, gently guiding a system towards its desired state. It continuously calculates the 'error' between a [Setpoint](/wiki/setpoint) and the actual [Process Variable](/wiki/process_variable), then adjusts its output to minimize this difference, ensuring stability and precision.
+## See also
+- [Control System](/wiki/control_system)
+- [Feedback Loop](/wiki/feedback_loop)
+- [Automation](/wiki/automation)