While often used interchangeably in casual conversation, the terms “pool” and “billiards” actually refer to distinct, albeit related, tabletop cue sports. Understanding these differences is key for any enthusiast looking to delve deeper into the intricacies of games played on a cloth-covered table with balls and cues. At their core, both sports involve striking a cue ball with a cue stick to propel other balls into pockets or achieve specific positional aims. However, the scope of “billiards” is broader, encompassing a family of games, while “pool” is a specific subset within that family.

The Grand Umbrella: Billiards
The term “billiards” historically refers to a genus of cue sports. It’s the overarching category that includes games played on a table without pockets, as well as those that do feature pockets. The original forms of billiards, originating in the 15th century in Europe, were typically played on a table without pockets. The objective was often to strike the cue ball so that it passed between two other balls (called “passes”) or to knock an opponent’s ball away from a target ball.
Carom Billiards: The Pocketless Pursuit
Within the broader realm of billiards, carom billiards (also known as “French billiards” or “American billiards”) stands as a prominent example of pocketless games. These games are played on a table that is typically larger and has no pockets. The most common carom games include:
Three-Cushion Billiards
This is arguably the most complex and strategically demanding of the carom games. In three-cushion billiards, the objective is for the cue ball to contact at least three of the other balls on the table, with at least three cushions being struck by the cue ball before it contacts any other ball. This “three-cushion” rule is the defining characteristic. Points are scored for successfully making these prescribed contact sequences. The game demands exceptional precision, foresight, and an intimate understanding of ball physics and cushion angles. Players must develop an almost intuitive feel for how the cue ball will react after striking cushions and other balls in rapid succession. The geometry and angles involved in achieving a three-cushion carom are intricate, often requiring the cue ball to execute a series of precise rebounds to meet the other balls.
Straight Rail Billiards
A simpler form of carom billiards, straight rail involves striking the cue ball to hit the other two balls. There is no requirement to hit any cushions. While simpler in its core objective, mastering straight rail still requires significant skill in controlling the cue ball’s trajectory and speed to achieve consecutive “passes” or caroms. The absence of cushion contact requirements allows for more direct, albeit still challenging, shot-making.
Balkline Billiards
Balkline games introduce a strategic element by dividing the table into zones using lines drawn on the cloth. Players are restricted in where they can make certain types of caroms. Specifically, a player cannot score a carom if both object balls are within a designated “balkline” area, unless the cue ball has contacted at least one cushion before striking the object balls. These balklines are usually drawn parallel to the cushions at a specific distance, creating zones where multiple caroms are forbidden without a cushion kiss. This rule forces players to strategically position their balls to avoid being trapped in the balkline and to create advantageous setups outside these zones.
Other Forms of Billiards
Beyond carom games, the term “billiards” can also encompass games that might share some characteristics with pool but are still classified under the broader umbrella. This can include historical variations or less common games that have specific rule sets distinguishing them. However, in modern parlance, when people refer to “billiards” without further qualification, they are often thinking of the pocketless carom games or, sometimes, the entire spectrum of cue sports.
The Pocketed Pursuit: Pool
“Pool” is a specific category within the larger family of billiards. It is characterized by games played on a table with six pockets: four at the corners and two along the sides. The objective in most pool games involves using the cue ball to pocket the object balls into these pockets. The term “pool” itself is believed to have originated from a game called “pool,” played in taverns in England, where betting money was placed in a “pool” before the game began.
The Dominant Games of Pool
Several distinct games fall under the umbrella of “pool.” These games vary in their rules, the number of balls used, and the objectives for pocketing them.

8-Ball
Perhaps the most widely recognized and played pool game globally, 8-ball is a game of “call your shot.” Players are assigned either a group of “solids” (balls numbered 1-7) or “stripes” (balls numbered 9-15). The objective is to pocket all of your assigned group of balls and then legally pocket the 8-ball. The twist is that the player must “call” the pocket into which they intend to sink each ball. Fouls can result in the loss of a turn, or in some variations, the opponent can “ball in hand” (place the cue ball anywhere on the table). The game is won by the player who legally pockets the 8-ball after clearing their own group of balls.
9-Ball
This game is characterized by its speed and reliance on strategic progression. 9-ball is played with balls numbered 1 through 9. The objective is to legally pocket the balls in numerical order, starting with the lowest numbered ball on the table. The game is won by the player who legally pockets the 9-ball. Unlike 8-ball, players do not call their shots; the primary rule is that the cue ball must strike the lowest numbered ball on the table first. If a player pockets the 9-ball out of sequence or fouls during the attempt, they do not win. 9-ball is often favored for its dynamic nature and the constant need for players to think several shots ahead, anticipating the position of the 9-ball and setting up future shots.
Straight Pool (14.1 Continuous)
This is a more traditional and demanding pool game that requires players to pocket a predetermined number of balls (often 100 or 150) consecutively. In straight pool, all 15 object balls are used. Players score one point for each ball they legally pocket. The key rule is that after a ball is pocketed, the player continues their turn. If they happen to pocket all 15 balls in one run, the balls are re-spotted (except for the 1-ball, which is placed at the foot spot) and the player continues their turn. The challenge lies in maintaining control of the cue ball and consistently setting up break shots to continue a run. This game demands exceptional cue ball control and strategic planning to avoid leaving oneself in a difficult position.
Other Pool Variations
Numerous other pool games exist, each with its unique set of rules and objectives. These include games like 10-ball (similar to 9-ball but with 10 balls), One Pocket (where each player is assigned a specific pocket to sink their balls into), Bank Pool (requiring balls to be “banked” off cushions), and Cutthroat (a multi-player game with distinct objectives for each player).
Key Distinctions Summarized
The primary differences between pool and billiards can be distilled into a few key points:
Pockets: The Defining Feature
The most significant differentiator is the presence of pockets. Games categorized as “pool” are always played on a table with pockets. “Billiards,” in its broadest sense, encompasses games both with and without pockets. Carom billiards, for example, is a pocketless discipline.
Scope and Terminology
“Billiards” is the umbrella term for all cue sports played on a table. “Pool” is a specific type of billiards that involves pocketed balls. It’s analogous to how “fruit” is a broad category, and “apple” is a specific type of fruit. All pool is billiards, but not all billiards is pool.
Ball Usage and Objectives
While both involve striking balls with a cue, the objective and the number of balls used can differ significantly. Carom games often use only three balls (cue ball and two object balls) with the aim of making caroms. Pool games typically use more balls and focus on pocketing them according to specific rules, such as numerical order or assigned groups.

Game Complexity and Strategy
The strategic nuances can vary widely. Carom games like three-cushion billiards demand an advanced understanding of physics and angles, often involving intricate multi-contact shots. Pool games, while also requiring skill and strategy, often focus on positional play, clearing specific ball groups, and executing precise pocketing shots.
In conclusion, while the layperson might use “pool” and “billiards” interchangeably, a deeper appreciation for cue sports reveals a clear distinction. Billiards is the ancestral house, and pool is one of its most popular and widely played rooms. Recognizing this hierarchy and the defining characteristics of each allows enthusiasts to navigate the diverse world of cue sports with greater clarity and understanding. Whether you’re aiming for a complex three-cushion carom or potting the 8-ball, the journey into these games is a testament to skill, strategy, and the elegant physics of colliding spheres.
