Non-cooperation movement was started by Mahatma Gandhi in 1920 A.D. in order to protest against the cruelties committed on the people of Punjab at Jallianwala Bagh, Amritsar and to redress the injustice done to Turkey. It was purely a non-violent movement. This movement was later on transformed into a mass movement:
Non-cooperation programmes:
(i) Surrender of titles and honorary offices
(ii) Resignation from nominated seats
(iii) Withdrawal of children institutions aided or controlled by the government
(iv) Gradual boycott of the British courts.
Truth and non-violence (Satya and Ahimsa) were to be the guiding principles of the non-cooperation movement.
Thus, the non-cooperation movement played a vital role in the history of India's independence. It taught Indians a new self respect, which could be content with nothing less than self-government.