As the others have said, in America, 'darn' is a softer expletive that 'damn'.
Over there, some people would get upset if you said 'damn'. Here, that's less likely, and 'darn' is not used, unless you are trying to sound American.
2017年9月21日
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Damn is a bad word but darn isn't a bad word?
2017年9月21日
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'darn' is a euphemism for `damn'.
In short, damn is stronger; darn is softer.
2017年9月21日
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They mean the same thing. Damn is basically a "bad word" so younger people tend to say darn. Either way, you can say both.