Salt is the basic requirement for every person.the british government took the monopoly of making salt and passed a law,banning manufacture of salt.on march 12,1930,mahatma gandhi began his epic dandi march from sabarmati ashram to dandi.that is how the march came to be known as dandi march.he was accompained by 78 supporters.they made salt from sea water and broke the law.that is how the ''salt march''become an effective tool of resistance aganist colonialism.