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Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply then it reverse the polarities means the cathode terminal get connected to positive and anode terminal get connected to negative, this turns off the thyristor.
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Answer : By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.

Description : Differentiate between Natural and Forced commutation

Answer : Natural commutation Forced commutation Source is AC Source is DC External commutating componants are not required  External commutating componants are required SCR turns off ... in controlled rectifiers, AC voltage controllers etc.  Used in choppers & inverters etc

Answer : Thyristor commutation means turning off thyristor.

Description : In a thyristor D.C. chopper, which type of commutation results in best performance ?

Answer : voltage commutation

Description : Class A Load Commutation

Answer : Class A: Load Commutation: The class A or load commutation (also called self-commutation or resonant commutation) is employed in thyristor circuits supplied from DC source. The commutating components include ... biased. Thus the zero-current and reverse-bias cause the thyristor to turn-off.