Spam - Unwanted e-mail (usually of a commercial nature sent out in bulk)
Scam - A fraudulent business scheme
Spam: Unsolicited e-mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups; junk e-mail.
Scam: A confidence game or other fraudulent scheme, especially for making a quick profit.
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Spam is tinned meat made from ham.
Scam is tinned meat made from dangogi.
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Spam - Inclusion of duplicate contents.
Scam - The business which never pays.