Blackjack: Introduction to the World’s Most Popular Casino Game

Written by Ian Mac
Ian Mac is a dedicated content writer and editor with consistent 5-star feedback when it comes to creating high-quality gambling content. He writes about casino bonuses, casino destinations and casino games including slots, roulette and blackjack.
, | Updated: September 25, 2025

Played in hundreds of casinos around the world and online, blackjack is a widely known gambling game that fascinates players with its apparent simplicity and the mystique surrounding the practice of card counting. This game is fast-paced, a spectacle to watch, and it involves an element of skill, so it is no wonder it attracts professional gamblers and casual casino-goers alike.

Often compared to poker because both games require skill, blackjack is much simpler and is played against a dealer rather than against other casino patrons who may be more experienced than you. As with most gambling games – and most things in life – blackjack is easy to learn but difficult to master. Perfecting one’s skills often takes years, hard work, and a great deal of dedication, but this should not stop gambling enthusiasts from trying to improve.

On the contrary, with the right sources of information, most people can easily learn the game and discover how to win consistently. Knowing the fundamental rules and principles is key to improving one’s skills, but it is also fascinating to explore the origins of blackjack and how it has changed over time.

History of Blackjack

1Origins of Blackjack

Blackjack’s origin is widely debated, and there is still no consensus on exactly how, when, or where the game began. What we do know is that it was not invented by a single person at a specific moment in time. Most researchers believe that the precursor to modern-day blackjack was a game known as Vingt-et-Un. This translates from French as Twenty-One, and it was played in gambling houses across France in the 17th century.

Similar gambling games existed even earlier, one example being Ventuina. This game was described in the Spanish novella collection Novelas Ejemplares, written between 1590 and 1612 by Miguel de Cervantes, the author of Don Quixote. An earlier Spanish variant, Trente-un (Thirty-One), used very different rules yet was clearly related to blackjack. Comparable games appeared throughout Europe, such as the French Quinze (which translates as Fifteen) and the Italian Sette e Mezzo, or Seven and a Half.

In the 18th century, French colonists brought Vingt-et-Un to the Americas, and the game soon spread through gambling establishments. It was later popularized by the licensed gambling halls in New Orleans, although its rules varied and cheating was common among both players and dealers. The game was offered across North America in the 19th century, but the name blackjack would not appear until decades later.

2Development of the Game

Because gambling was illegal in France during the 19th century, Twenty-One did not evolve there. Instead, it changed and eventually became the modern game in the United States after Nevada legalized gambling in 1931.

3Las Vegas and House-Banked Blackjack

Before gambling was legalized, Las Vegas was only a small settlement. In 1931, however, construction of the Hoover Dam brought thousands of young male workers, and local authorities legalized gambling to capitalize on the potential revenue. The newly licensed casinos and regulators quickly realized they needed standardized rules and oversight.

By then, the game of 21 was already extremely popular, and to attract customers, casinos offered a variety of bonus payouts. One such reward paid 10 times the bet when a player held an Ace of spades and a black Jack. This hand was called blackjack, and although casinos eventually discontinued the 10:1 payout, the name stuck.

4Edward O. Thorpe and the Beginning of Card Counting

Blackjack quickly became gamblers’ favorite game, and many claimed they could track the cards and gain an advantage over the casino. In the 1940s and 1950s, several legendary players used systems that seemed more mysterious and magical than practical. Before long, mathematicians also grew fascinated with blackjack and the theory behind it.

One of them, Edward O. Thorpe, began analyzing the game with an IBM 704, one of the earliest computers capable of handling complex mathematical equations. Thorpe developed a theory that demonstrated mathematically that the house edge in blackjack could be overcome by card counting. In 1962, he described the Ten-Count system in his book Beat the Dealer, marking the official start of card counting. The probability theory he employed also became fundamental to the development of modern blackjack strategies.

What Is Blackjack Today?

Today, blackjack is a gambling game played with one or more standard 52-card decks with the Jokers removed. Standard American blackjack usually uses six or eight decks, but there are also games that employ one, two, or four decks. While the four suits are irrelevant (except for bonus payouts in some blackjack variations), the value of the cards is what matters, as this is a comparing game. In other words, players compare their hands to the dealer’s hand in an attempt to beat it.

Typically, a game of blackjack is played on a special semicircular table where the dealer sits opposite five to seven player seats. Each player has a betting position marked on the felt with additional boxes for side bets in some blackjack variations. Because this is a banking game, casino patrons play against the dealer – whereas in poker, players compete against one another.

Basics of the Game
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Basics of the Game

The objective of the game is to beat the dealer by holding a hand whose value is as close to 21 as possible. If the hand exceeds 21, it is called “busting,” and the player immediately loses. The strongest hand is called blackjack and consists of an Ace and any 10-value card.

The cards have different point values – cards from 2 to 9 are counted at face value, whereas cards from 10 to King count as 10. The Ace, however, can be worth 1 or 11. A blackjack hand – an Ace and a 10-value card – totals 21. Of course, not all 21-value hands are blackjack.


Gameplay

After players place their bets, the dealer deals two cards face-up to each player and two cards to himself. In American blackjack, only the dealer’s first card is exposed – the second is dealt face-down so players cannot see it. The dealer is allowed to peek if his upcard is an Ace or a 10-value card; in other words, if he may have blackjack.

Each player then has several options: draw another card (“hit”), refuse additional cards (“stand”), or double the bet (“double down”). Those who double receive one final card, after which their turn ends and their stake is doubled. Players who receive two cards of the same value can also choose to “split” the pair into two hands – an additional card is then dealt to each new hand. Naturally, this second hand requires a second bet equal to the original stake.

Some games also allow players to buy Insurance, betting that the dealer will have blackjack, while others offer the option to surrender half of the bet and end the hand.

Once all players act, the dealer also hits or stands according to the specific house rules. However, the dealer cannot double down, surrender, or buy Insurance. Typically, the rules state whether the dealer must stand or hit on 17 and specify which types of 17-value hands this applies to.


Payouts

Most blackjack variations pay the same amount of money for winning hands. Typically, players who receive blackjack on the initial deal win immediately and are paid 1.5 times their wager. This is usually shown as 3:2 on the game’s paytable. When a player’s hand is stronger than the dealer’s without exceeding 21, it is a regular win and pays even money.

Blackjack tables usually display the payouts for two main outcomes. One is the 3:2 blackjack payout and the other is the Insurance payout, which is 2:1. If the game offers side bets or bonus payouts for specific hands, these will also be listed on the table.

Blackjack vs Other Casino Games

The best casino game

Chance-Based Games

Skill-Based Games

Because blackjack is a form of gambling, it is inevitably compared to games like roulette and slot machines. While the game has its fans, many players prefer slot machines because they are extremely easy to play – there is no skill involved, so you simply rely on chance to land a winning combination. Which casino game, then, is the best?

Ultimately, the answer depends on each casino patron’s individual tastes and preferences. Some players enjoy the simplicity of slots, others are captivated by the elegance of roulette, and many appreciate the challenging nature of table poker.

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Blackjack Games

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Online Blackjack

Online blackjack is played much like traditional table blackjack – it follows the same rules and offers the same payouts. It is available at hundreds of online casinos and can often be played without wagering real money. Thanks to the game’s popularity and the boom of gambling sites over the past couple of decades, software developers have created more blackjack variations than you would find in any land-based casino.


RNG Games

In its virtual form, blackjack is far more accessible than the traditional game found only in licensed gambling establishments. It is designed to simulate the real-life experience, so players see the familiar blackjack table, virtual chips, and cards dealt from a six- or eight-deck shoe. When played online against a computer, the game is completely fair, and players are free to apply any strategies or betting systems they prefer.

Each deal is random, guaranteed by complex computer software known as a Random Number Generator, or RNG. RNG technology underpins countless computer games; in gambling, it recreates the randomness of a freshly shuffled deck of cards. Because RNG-based blackjack has no predictable patterns or sequences, it eliminates the effectiveness of card counting, card tracking, and other advantage play methods still possible in brick-and-mortar casinos.


Live Dealer Blackjack

Online blackjack players can also choose to play against a real dealer. Live casino lobbies combine the best of both worlds – the thrill of in-person gambling with the convenience of online play. Here, high-rollers can wager hundreds or even thousands of dollars because table limits are typically more liberal.

Live games are usually streamed from professional studios, though some are hosted by land-based casinos with dedicated live tables. Multiple camera angles, live chat options, and elegant casino settings create the feel of being in an actual casino. The cards are dealt by professional dealers, and the tables feature seven seats – just like those in Las Vegas.

These games are not as fast-paced as RNG blackjack, so players can savor the betting experience. They can usually select tables with various betting limits and languages other than English. Unlike virtual blackjack, however, live tables are not always available 24/7.

Blackjack Glossary

21

Advantage Player

Bankroll

Balanced Count

Basic Strategy

Betting Limits

Blackjack

Burn Card

Bust

Card Counting

Cut Card

Dealer

Deck

Deck Penetration

Double Down

Early Surrender

Even Money

Face Card

Five Card Charlie

Flat Betting

Hard Hand

High Roller

Hit

Hole Card

House Edge

Insurance

Late Surrender

Natural

Pat Hand

Perfect Pairs

Progressive System

Push

Shoe

Shuffle

Soft Hands

Spanish Deck

Split

Stand

Stiff Hand

Surrender

Tie

Unit

Upcard

Wager

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