A PID board, or proportional-integral-derivative board, is an electronic control system commonly used in industrial automation and process control. It regulates various processes by continuously adjusting control variables such as temperature, pressure, flow rate, or level based on feedback from sensors. The PID algorithm calculates an output signal based on the proportional, integral, and derivative terms to achieve the desired setpoint while minimizing errors and ensuring stability. PID boards are essential components in manufacturing, chemical processing, power generation, and other industries where precise and efficient process control is critical for productivity and quality assurance.