Casino, poker & betting terms explained
Plain-English definitions of 12 terms you'll run into across casino games, poker and sports betting, with why each one matters and an example.
Curaçao License · KYC (Know Your Customer) · Multi-Table Tournament (MTT) · Pot Odds · Progressive Jackpot · Provably Fair · Rake (Poker) · Reality Check · RNG (Random Number Generator) · Self-Exclusion · Volatility (Slot Variance) · Welcome Bonus
Curaçao License
A gambling license issued by the Curaçao Gaming Authority — historically one of the most common licenses for internationally-facing operators, with lighter player-protection requirements than tier-one regulators like the UKGC or MGA.
Why it matters
Not all licenses offer the same level of player protection or dispute resolution. Knowing the difference between a Curaçao license and a tier-one license like the UKGC or MGA helps set expectations about recourse if something goes wrong.
Examples
- A Curaçao-licensed operator may have fewer mandated responsible-gambling tools than a UKGC-licensed one.
- Since 2023, Curaçao has been reforming its licensing framework toward individual master licenses rather than the older sub-license model.
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KYC (Know Your Customer)
The identity-verification process licensed operators are legally required to run — checking your ID, address, and sometimes payment method — usually before a first withdrawal.
Why it matters
KYC is a regulatory requirement, not a sign something is wrong with your account. It exists to prevent underage play, fraud, and money laundering, and every licensed operator uses some version of it.
Examples
- A UKGC-licensed casino may ask for a photo ID and a recent utility bill before releasing your first withdrawal.
- Some operators run KYC checks automatically in the background using data-matching services, with no document upload needed unless a check fails.
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Multi-Table Tournament (MTT)
A poker tournament format where hundreds or thousands of players compete across many tables simultaneously, with tables consolidating as players are eliminated, until a single final table remains.
Why it matters
MTTs are how the largest guaranteed prize pools in online poker are built, including headline events like the Venom on America's Cardroom — but they also carry much higher variance than cash games or Sit & Gos.
Examples
- A $10 MTT with 5,000 entrants might pay only the top 15% of the field, with the winner taking a disproportionate share.
- Late-registration periods let players join an MTT already in progress, usually for the first hour or two.
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Pot Odds
The ratio between the current size of the pot and the cost of a contemplated call, used to judge whether a drawing hand is statistically worth continuing.
Why it matters
Pot odds are one of the few purely mathematical decisions in poker — comparing them to your hand's actual odds of improving is a foundational skill for any player moving past beginner level.
Examples
- If the pot is $100 and you must call $20, you're being offered 5-to-1 pot odds.
- A flush draw after the flop completes roughly 35% of the time by the river — worth comparing directly against the pot odds you're being offered.
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Progressive Jackpot
A jackpot that grows every time the game is played, funded by a small percentage of each wager across some or all players on the network, until someone wins it and it resets to a base amount.
Why it matters
Progressive jackpots can reach life-changing sums, but the odds of hitting one are dramatically lower than winning a fixed-prize slot — understanding the mechanic helps set realistic expectations.
Examples
- A networked progressive jackpot pools contributions from the same game running at multiple casinos.
- A standalone progressive only grows from bets placed on that single machine or game instance.
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Provably Fair
A verification method, mostly used by crypto-native gambling platforms, that lets a player cryptographically confirm a game result was not altered after it was generated.
Why it matters
Provably fair is a different trust model from traditional RNG certification: instead of trusting a third-party lab's testing report, the player can independently verify individual results themselves.
Examples
- A provably fair dice game reveals a hashed server seed before the bet, then the plain seed after, so the player can confirm the result matches.
- Provably fair systems are common on crypto casinos but are not yet standard on most fiat-licensed operators, which instead rely on RNG lab certification.
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Rake (Poker)
The commission a poker room takes from cash-game pots or tournament buy-ins, usually a small percentage capped at a fixed maximum per hand.
Why it matters
Rake is how poker rooms make money without being a player in the game themselves. Understanding rake structure matters because it directly affects how profitable a game is for a regular player.
Examples
- A typical cash-game rake might be 5% capped at $3 per hand.
- Tournament rake ('juice') is usually built into the buy-in, shown as, for example, $10 + $1.
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Reality Check
A responsible-gambling tool that pops up a notification after a set amount of time in a game, showing session length and net win/loss, so a player can decide whether to continue.
Why it matters
Reality checks interrupt the kind of time-distortion that's common in slot and live-casino play — a quiet nudge back to the fact that time and money are passing.
Examples
- A UKGC-licensed operator might default to a reality check every 60 minutes for slots.
- Reality checks are usually adjustable but not always removable entirely, depending on the operator's licensing requirements.
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RNG (Random Number Generator)
The algorithm inside a licensed casino game that produces each spin, card, or dice result independently and unpredictably, so no outcome can be predicted from previous ones.
Why it matters
The RNG is the mechanical basis of fairness in every digital casino game. Licensed operators are required to use RNGs that have been independently tested, which is what stops a game from being secretly weighted against players.
Examples
- A slot's RNG decides which symbols land on the reels the instant you press spin — the animation is just a visual delay.
- In online blackjack, the RNG determines card order before the deal, not after you make a decision like hit or stand.
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Self-Exclusion
A responsible-gambling tool that lets a player voluntarily block their own access to an operator, or in some countries to all licensed operators at once, for a set period or indefinitely.
Why it matters
Self-exclusion is one of the few gambling controls with real teeth — once activated it typically can't be reversed early, even by the player asking, which is precisely the point.
Examples
- GAMSTOP lets a player self-exclude from every UKGC-licensed operator at once, for 6 months to 5 years.
- Individual operators also offer their own account-level self-exclusion or cool-off periods, separate from national schemes.
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Volatility (Slot Variance)
How a slot game's payouts are distributed over time — low volatility means smaller, more frequent wins; high volatility means bigger but rarer wins, with longer losing streaks in between.
Why it matters
Two slots can share the same RTP but feel completely different to play. Volatility, not RTP alone, is usually what determines whether a session feels smooth or feels like a rollercoaster.
Examples
- A low-volatility slot might return small wins on 1 in 4 spins.
- A high-volatility slot might go 40+ spins without a meaningful win, then pay out a large multiplier.
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Welcome Bonus
A promotional offer for new players, typically matching some percentage of a first deposit up to a stated cap, subject to wagering requirements before any winnings can be withdrawn.
Why it matters
Welcome bonuses are the most heavily marketed offer type and also the one most often misunderstood — the headline number rarely reflects what a player can actually withdraw without meeting the attached conditions.
Examples
- A '100% up to $500' welcome bonus matches your deposit dollar-for-dollar, capped at $500 in bonus funds.
- The same bonus might carry a 35x wagering requirement, meaning the deposit-plus-bonus total must be wagered 35 times before withdrawal.