Mahatma Gandhi's principle of "non-violence" was formally known as?

All four terms are associated with Gandhi's philosophy.

Satyagraha is loosely translated as 'insistence on truth' (satya 'truth'; agraha 'insistence' or 'holding firmly to') or holding onto truth or truth force. The term was coined and developed by Mahatma Gandhi and was used to underpin a particular form of civil resistance. The concept of satyagraha is not the same as passive resistance, but advocates resisting non-violently over using violence. Gandhi’s Salt March (12 March 1930 to 6 April 1930) is a good example of satyagraha. The march was a nonviolent protest against the British salt monopoly and involved walking ten miles a day for 24 days, during which Gandhi and his 80 companions were joined by others along the way. When Gandhi broke the salt laws at the end of the march, it sparked large scale acts of civil disobedience against the British Raj salt laws by millions of Indians.

Padayatra is a journey undertaken by a politician(s) and/or prominent citizen(s) to interact more closely with different parts of society, educate about issues concerning them, and galvanize his or her supporters.

Sarvodaya is a Sanskrit term meaning 'universal uplift' or 'progress of all'.

Swaraj usually refers to Gandhi's concept for Indian independence from foreign domination.