In poker, a freeroll has two distinct meanings. One applies to the play of a single hand, and the other describes an entire poker tournament.

Freeroll hand

In playing a particular hand of poker, a freeroll is a situation that arises (usually when only two players remain) before the last card has been dealt, in which one player is guaranteed to at least split the pot with his opponent no matter what the final cards are, but where there is some chance he can win the whole pot if certain final cards are dealt. This most commonly occurs in a high-low split game where one player knows that he has a guaranteed low hand made, his opponent cannot make a better low no matter what the last card is, but the player who is low might possibly catch a lucky card that gives him a straight or flush, winning high as well.

Here's an example from Texas hold'em: Angie holds K♣ 10♣, and Burt holds K♥ 10♥. After round three, the board is A♣ Q♠ J♥ 4♣. Both players have an ace-high straight, the current nut hand, and so they will most likely split the pot. But if the final card happens to be a club, Burt's straight will lose to Angie's flush. There is no other possible final card that will give Burt more than a split; only Angie can improve, so she is freerolling Burt.

If a player knows he has a freeroll, he can raise the pot with impunity, and often a less-skilled opponent with a good hand who does not realize that he is on the wrong end of the freeroll will continue to put in raises with no possible hope of gain.

Freeroll tournament

The prize pool, instead of being an accumulation of the entry fees minus a fee for the 'house' (the way pay-to-play tournaments are typically constructed), is derived from a donation from the house, sponsorship fees, admission charged to spectators, broadcast rights fees, or any combination of these. Sometimes a particular cardroom or casino (either traditional or online) will offer a freeroll tournament to frequent players. Invitation-only tournaments are frequently freerolls.

Freerolls at Internet poker sites should not be confused with their close counterpart -- play money tournaments. Freerolls are different from play-money tournaments in two respects. Play money tournaments usually require the 'payment' of play money and the tournament winnings are play money. Freeroll tournaments can be genuinly free, may require a payment of points (from a point system developed by the site), or on some occasions require a deposit of funds into the player's account. The winnings are either real money, points, merchandise or entry tickets (invitations) to other tournaments.

Most if not all Internet poker sites have freeroll tournaments although in many cases require a payment of points to play. These points typically can only be earned by paying and playing real money hands which in essence is a payment required to play their 'freerolls' and therefore a loose use of the term 'freeroll'. There are Internet sites that allow playing in freerolls without payment of any kind and with the chance to win real money.