What was the Dandi March? Why did Gandhiji organised the Dandi March?

Dandi March was a March started by Gandhiji from Sabarmati Ashram to Dandi, to break the Salt Law.

Mahatma Gandhi gave the call for a civil Disobedience Movement in 1930. Before starting the movement, Gandhiji served on the British government a 'Eleven point Ultimatum'. After waiting in vain for the government response to his ultimatum, Gandhiji started the movement with his famous Dandi March (March 12 to April 6). He broke the Salt Law by picking up salt left by the sea waves. He selected the Salt Law because the salt tax affected all sections of the society.