What Is RNG: Why Random Number Generators Are Important

Online Casino - 3D Roulette Wheel, Slot Machine - RNG Neon Letters

You may not be aware of this fun little fact, but Random Number Generators (RNGs) are the lifeblood of the online casino world. Without them, the fairness, unpredictability, and excitement that come with each spin, click, or tap would simply not exist.

Do we sound a tad dramatic about this tool? Maybe, but we aren’t wrong! You’ll see why we definitely aren’t overstating the importance of RNGs when you find out and fully grasp why they are the core of online casino games.

The Crux of RNGs in Online Gaming

At its simplest, an RNG is a complex algorithm that produces numbers seemingly out of thin air. These numbers determine the outcomes of online games, from which symbols appear on a slot machine to the order of cards in a digital deck. But how does this digital wizardry actually work?

There are two champions in the story of RNGs: True Random Number Generators (TRNGs) and Pseudorandom Number Generators (PRNGs).

  • TRNGs draw their randomness from physical phenomena, like atmospheric noise, making each outcome genuinely unpredictable.
  • PRNGs, on the other hand, use mathematical algorithms to generate long sequences of numbers that appear random but are actually predetermined by a starting number known as a seed.

Why RNGs Are the Foundation of Fair Play

Say you are indulging in your fav slot game online. The fun isn’t just in the visuals or the sound effects; it’s in the exhilarating and anxiety-inducing moment when you hit ‘spin’ and await your fate. RNGs guarantee that what comes next is anybody’s guess. This unpredictability is far-reaching for fair play. Every player has an equal chance at winning, and there’s no pattern to predict, exploit or manipulate.

Regulatory bodies take RNGs seriously. Before an online casino can even open its virtual doors, its RNG software undergoes painstaking testing by independent auditors. These tests certify that the outcomes of games are completely random and unbiased, mirroring the unpredictability you’d find in a physical casino.

RNGs and Game Design: A Creative Challenge

For game developers, RNGs offer both a challenge and an opportunity. The challenge lies in creating games that are not only fair and unpredictable but also engaging and fun. This is where the opportunity comes in—understanding the mechanics of RNGs, developers can build games with a variety of outcomes and bonus features, which means players will always be on the edge of their seats waiting to see where the spins will stop.

Take slot games, for example—modern online slots come with an abundance of themes, symbols, and bonus rounds, all determined by RNGs. The assortment in gameplay and the sheer unpredictability of each spin make these games a fan-favorite staple in online casinos.

Exploring the Games: RNGs at Work

RNGs are the bread and butter of nearly every online casino game you can think of. Here’s a closer look at some of the most popular ones and how RNGs play a part in their outcomes:

Online Slots

The most iconic and queen bee use of RNGs is when playing online slots. Every time you press the spin button, the RNG generates a random sequence of numbers that determines the symbols displayed on the reels. This mechanism clinches that each and every spin is independent of the last, making it impossible to predict what will come next. The variety of slot game themes all rely on RNGs to keep the game outcomes random and fair.

Digital Table Games

BetMGM Casino Poker Game Mobile
  • Roulette: In digital roulette, RNGs are used to simulate the random bounce of the ball in the wheel. When you place your bets and hit ‘spin,’ the RNG decides which pocket the ball will land in, ensuring every spin’s outcome is completely random.
  • Blackjack: RNGs shuffle the digital deck in online blackjack games. Unlike physical casinos, where card counting can be a strategy, RNGs ensure a fully shuffled deck with every hand, making the game fair and unpredictable.
  • Baccarat and Poker: Similar to blackjack, baccarat, and poker games use RNGs to shuffle and deal cards. This guarantees that the order in which cards are dealt is entirely random, closely mimicking the unpredictability of playing with a physical deck.

Video Poker

Video poker combines elements of slots and traditional poker, relying on RNGs to deal cards. Once you hit ‘deal,’ the RNG selects the cards from a standard 52-card deck (or 53, if there’s a joker), ensuring each hand is random and different.

Lottery-Style Games

Games like bingo, keno, and scratch cards also depend on RNGs to determine the numbers or symbols. In bingo and keno, RNGs draw the numbers, ensuring each game’s outcome is random. For digital scratch cards, RNGs decide which symbols will be hidden under the surface, awaiting your virtual coin.

Progressive Jackpots

Gold Coins in Piles - Jackpot Graph

Even games with progressive jackpots, where the prize pool increases each time the game is played but not won, utilize RNGs. The moment that triggers the jackpot win is also determined by an RNG, ensuring that everyone has an equal chance of hitting that life-changing prize.

Live Dealer Games

While live dealer games try to replicate the IRL casino experience with real dealers and equipment, RNGs still find a home, especially in shuffling virtual decks or determining the outcome of side bets. This hybrid approach sews up the authenticity of live play while keeping the integrity and fairness established by RNG technology.

The Future of RNGs in Online Gaming

As technology advances, so too does the sophistication of RNGs. The future could bring even more secure and unpredictable algorithms, further warranting the fairness and integrity of online casino games. Moreover, as virtual reality (VR) and augmented reality (AR) technologies grow, RNGs will play a central role in creating super immersive and interactive gaming experiences, blurring the lines between the digital and the real world, which will be so cool to experience!


RNGs are so much more than just a technical necessity; they’re the guardians of fairness and fun in the online casino world. This technology not only upholds the integrity of online gaming but also preserves the enjoyment and excitement that draws players to the virtual casino floor. Whether you’re a fan of the instant gratification of slots or the strategic gameplay of table games, RNGs are there to make certain your gameplay is both enjoyable and equitable.

No matter if you’re spinning the reels, calling ‘blackjack,’ or watching the roulette wheel spin around and around, you can do so with the assurance that every outcome is as random as it would be in the best casinos in Las Vegas or Monte Carlo. So, the next time you log on to your favorite online casino, remember the unseen hero that is the RNG, working overtime to guarantee that your gaming experience is both fun and fair!

Alicia Green
Alicia Green

Alicia Green has earned her reputation as an authority on the online gambling world. With a keen eye for the latest trends and a gift for clear, compelling communication, Alicia transforms in-depth casino app reviews into accessible, engaging reads. Her work serves as a personal navigator through the vast ocean of online casinos, directing you towards your next go-to game or platform with straightforward, trustworthy guidance. If you're seeking advice with no frills but full of integrity, Alicia's articles are your essential resource.