The object of Jacks or Better video poker is to obtain a five-card poker hand that contains a winning combination (see the paytable on the machine). The better your hand, the bigger the payout. You choose how many and which of your cards are to be replaced. You may replace your cards only once.
The lowest winning combination is a pair of Jacks: a pair of any lower cards (for example, Tens) is not a winning combination; a pair of any higher cards (for example, Queens) is a winning combination.