Unlike a sweepstakes, a lottery is a promotional device by which items of value (prizes) are awarded to members of the public by chance—but some form of payment is required to participate. Lotteries are illegal, except when conducted by states and certain exempt charitable organizations. If you believe you have received a solicitation characterized as a sweepstakes that is in fact an illegal lottery, you should contact your local Post Office or state Attorney General’s consumer protection office.