What is a PID controller?

Question

Accepted Answer

A PID controller is a type of control loop feedback mechanism used in systems to control the output based on the difference between the desired setpoint and the actual process variable.

PID stands for Proportional-Integral-Derivative, which are the three terms used to describe the controller's actions.
The proportional term responds to the current error, the integral term responds to the accumulation of past errors, and the derivative term responds to the rate of change of the error.
PID controllers are commonly used in industrial control systems, robotics, automotive control systems, and more.
Example: A thermostat in a heating system that adjusts the temperature based on the difference between the setpoint and the actual room temperature.