The threat of a contest fraud
Contest frauds are ways for people to steal your money through you handing them the information to your credit card, bank account, or just through you giving them a "deposit check", or just wiring them money.
Examples of Contest fraud
Examples of this are pop-up adds that say things along the lines of, "You're the 1,000th person on this website", "click here to win a free Ipad", and "You have 20 seconds to claim your prize, or it will go to someone else"
How to avoid
Common sense, don't give out personal information, don't click on strange pop-up ads