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Dear editor,rnThis study reports the discovery of active disturbance rejection control (ADRC).Second-order linear ADRC (LADRC), the basic and most popular ADRC, can be interpreted as a modified proportional-integral-derivative (PID) control.LADRC filters the PID feedback compensator with a second-order low-pass filter;it also adds a pre-filter.Simultaneously, each given PID controller can be viewed as a special case of a secondorder LADRC feedback compensator whose observer bandwidth is positive infinity.