Online Casino Glossary

How to use this glossary

Definitions here are educational. They describe common industry meanings, not the exact wording of any one operator’s terms. When a bonus, game or cashier uses a phrase differently, the operator’s published rules win.

For longer explainers, follow the inline links to full guides. To explore online casinos on this site after you understand the vocabulary, use the homepage hubs and open games only when they are available to you.

Game maths and slots

RTP (return to player) — The theoretical long-run proportion of stakes a game is designed to return as prizes across a very large number of rounds. Not a session promise.

House edge — Typically 100% minus RTP. The long-run share of stakes retained by the house for that game configuration.

Volatility (variance) — How bumpy results tend to feel: quieter, more frequent small pays versus longer dry spells and larger potential features.

RNG (random number generator) — Software that produces the random outcomes behind most online slots and many table games.

Paytable — The in-game list of symbol values, feature rules and how wins are calculated for your stake.

Payline / ways — The patterns or systems that define a winning combination. Cluster pays and “ways” titles may not use classic lines.

Hit frequency — How often any winning combination tends to appear. Related to feel, but not the same as RTP or volatility.

Maximum win / win cap — An upper limit on prizes stated in the game rules for a feature or overall. Check the help file; marketing trailers may omit caps.

Progressive jackpot — A prize pool that grows as players stake, until it is won under the game’s trigger rules. Funding the pool can affect base-game return versus a non-progressive version.

Bonuses and promotions

Casino bonuses — Offers such as a welcome bonus or deposit match that add bonus funds, and sometimes free spins, when you opt in under stated terms.

Wagering requirements (playthrough) — How many times bonus funds, and sometimes the deposit, must be staked before withdrawal is allowed under the offer.

Game contribution — The percentage of each stake that counts toward wagering. Slots often contribute more than tables; some games may contribute nothing.

Free spins — Spins awarded on specified games, usually with their own win caps, expiry and wagering rules.

Maximum bet (during bonus) — A stake cap while wagering an offer. Exceeding it can void winnings under many sets of terms.

Bonus abuse — Operator language for patterns they treat as misuse of promotions (for example multiple accounts or coordinated claiming). Defined in each brand’s terms.

Cashable / withdrawable balance — Funds that are not locked behind unfinished wagering or other offer restrictions.

Payments, verification and accounts

Payment methods — The categories shown in the cashier for deposits and withdrawals. The method list on your account overrides blog summaries.

KYC (Know Your Customer) — Identity and sometimes address or payment checks operators use before releasing withdrawals or enabling certain features.

Withdrawal pending / in review — Status labels that mean the payout has not finished operator processing. Timing is not universal; withdrawal times explains the stages without promising a clock.

Return-to-source — A common rule that withdrawals should go back via the deposit method where possible, or to an account in your own name.

Credit card ban (Great Britain) — Credit cards are banned for gambling in Great Britain. Debit and other permitted options may still appear where UK rules apply.

Closed-loop payments — Industry shorthand for keeping deposit and withdrawal routes aligned to reduce fraud and third-party cash-outs.

Tables, live casino and lobby language

RNG table game — Digital blackjack, roulette, baccarat and similar games resolved by software rather than a live dealer stream. Category map: online casino games explained.

Live casino — Real dealers streamed to your device, with bets placed through the interface. How that differs from slots is covered in live casino vs online slots.

Side bet — An optional extra wager on a table game, often with a different (commonly higher) house edge than the main bet.

Lobby — The catalogue of available games and categories for your account and location.

Demo / play-money mode — Practice play without real-money stakes where an operator offers it. Demo rules or RTP displays can differ from real-money mode; check what the product states.

Safety, licensing and player controls

UKGC / Gambling Commission — The regulator for remote gambling offered to consumers in Great Britain. Licensing checks belong in any safety review: how to choose a safe online casino.

Operating licence — Authorisation for an operator to offer specified gambling activities in a market. Verify published details on the relevant public register when a number is shown.

Self-exclusion — A tool to block yourself from gambling with participating operators for a chosen period. In Great Britain, GAMSTOP covers many licensed remote operators.

Deposit limit / loss limit / session reminder — Operator or account tools that cap spend or prompt you to take a break. Set them before you play heavily.

Responsible gambling — Practices and tools that help keep play within affordable limits. Start with our responsible gambling page for on-site tools and independent UK support links.

Terms and conditions — The contract for your account, bonuses and disputes. Prefer written terms over verbal summaries from support.

Quick comparison phrases you will see in reviews

When articles talk about “comparing casinos”, they usually mean weighing licensing clarity, payments, game range, bonus terms and support — not chasing the loudest headline offer. Frameworks: how to compare online casinos and what makes a good online casino.

Product browsing on this site sits under hubs such as casino games and promotions when those areas are open to you. Availability and licensing still need a separate check against each operator’s published details — a .co.uk domain or British-facing copy is not proof that real-money play is authorised for Great Britain.

Frequently asked questions