What do you understand by cognitive dissonance? How can a civil servant deal with the same?

What do you understand by cognitive dissonance? How can a civil servant deal with the same? (GS 4)

आप संज्ञानात्मक मतभेद से क्या समझते हैं? कैसे एक सिविल सेवक इसका सामना कर सकता हैं?