Prize-linked savings account

A prize-linked savings account (PLSA) or lottery-linked deposit account is a savings account in which some of the interest payment on bank deposits or marketing dollars are distributed as prizes based on chance. They are attractive to consumers as they function both as a sweepstakes or game of chance (as there is a small chance of a large prize) and as savings vehicle (the deposit is never lost, unlike normal lotteries).

Source: Wikipedia — Prize-linked savings account (CC BY-SA 4.0)