What was the purpose of dandi march?

Answer 1

During the colonial rule in India, the British government imposed heavy taxes on everything including the cheapest and most important item of Indian salt. It was illegal to make salt without authorization. Mahatma Gandhi encouraged Indians to break the Salt tax law in order to involve Indian masses, including the poor, to defy the oppressive law imposed by British government.

Answer 2

The British used to impose salt tax in British-India, which was a ludicrous concept because Indians were expected to pay heavy taxes on a most essential item that was produced indigenously. The British has also banned the production and sale of salt by anyone else than a few licensed British Corporations.

Mahatma Gandhi, propagating his principles of passive resistance and peaceful demonstration (Satyagraha) decided that he will violate the Salt law, and led a march of over 400 volunteers from Sabarmati to the coastal town of Dandi in Gujarat. There, he ceremoniously produced salt by boiling sea water.