Three-card monte – also known as find the lady and three-card trick – is a confidence game in which the victims, or "marks", are tricked into betting a sum of money, on the assumption that they can find the "money card" among three face-down playing cards. It is very similar to the shell game except that cards are used instead of shells.

Gambling is the wagering of something of value on a random event with the intent of winning something else of value, where instances of strategy are discounted. Gambling thus requires three elements to be present: consideration, risk (chance), and a prize. The outcome of the wager is often immediate, such as a single roll of dice, a spin of a roulette wheel, or a horse crossing the finish line, but longer time frames are also common, allowing wagers on the outcome of a future sports contest or even an entire sports season.