Online Casino Glossary — Essential Terms Explained

Bonus terms and game info panels are full of shorthand that assumes you already know what it means. This glossary covers the terms that actually change how a session or a bonus plays out — not an exhaustive dictionary, just the ones worth understanding before you deposit.

RTP (Return to Player)

RTP is the percentage of all money wagered on a game that’s returned to players over a very large number of rounds — typically millions, not the handful you’ll play in one sitting. A 96% RTP means the game returns $96 for every $100 wagered across its full lifetime, not that you’re guaranteed to see 96% of your own stake back. It’s a long-run average, not a per-session promise.

Volatility (Variance)

Volatility describes how a game’s payouts are distributed, separate from its RTP. Low-volatility games pay smaller amounts more often; high-volatility games pay rarely but can pay much larger multiples of the stake when they do. Two games can share an identical RTP and still feel completely different to play because of this.

Wagering Requirement

What is a wagering requirement — it’s the multiplier applied to a bonus amount that you need to stake (not win) before the bonus converts to withdrawable cash. A $100 bonus with 30x wagering needs $3,000 in total bets placed before it unlocks. Wagering usually applies to bonus funds and any winnings generated from them, not to your original deposit, which typically stays withdrawable at any time.

Paylines & Ways to Win

A payline is a fixed pattern across the reels that needs matching symbols to land a win — classic slots might have just one; video slots often have 20 or more. “Ways to win” (or “megaways”) formats skip fixed lines entirely, paying for matching symbols in adjacent reel positions regardless of exact line, which is why reel height sometimes changes between spins on those titles.

Progressive Jackpot

A progressive jackpot grows with every bet placed on that game (sometimes across a whole network of casinos) until someone triggers it, then resets to a base amount. Because the prize pool is shared and unpredictable, progressive titles are almost always excluded from bonus wagering contribution — worth checking before assuming a jackpot slot counts toward clearing a bonus.

House Edge

The house edge is the mathematical advantage built into a game’s payout structure, expressed as a percentage — it’s effectively the inverse of RTP (a 97% RTP game has a 3% house edge). It’s not a fee taken from each bet; it’s the statistical result of how payouts are structured across every possible outcome.

RNG (Random Number Generator)

The software behind every pokie spin and RNG table game result — see our full RNG explainer for how it actually works and how it’s tested.

KYC (Know Your Customer)

The identity verification process — photo ID and proof of address — required before withdrawal at any licensed real-money platform. It exists to prevent fraud and underage access, and it’s a one-time process per account, not a repeat hurdle on every cash-out.