What is Confidence Trick?

Legal Definition
A confidence trick (synonyms include confidence game, confidence scheme, ripoff, scam and stratagem) is an attempt to defraud a person or group after first gaining their confidence, used in the classical sense of trust. Confidence tricks exploit characteristics of the human psyche such as dishonesty, honesty, vanity, compassion, credulity, irresponsibility, naïveté and greed.
-- Wikipedia
Legal Definition
A scheme to get access about a victim that is niave.