Baseball is a bat-and-ball team sport played between two teams of nine players who take turns batting and fielding. The batting team tries to score runs by hitting a pitched ball and running around four bases arranged in a diamond, while the fielding team tries to record three outs to end the turn at bat, called a half-inning.

The objective is simple: score more runs than the other team over the course of the game. A run is scored each time a base runner safely touches first, second, third base, and then home plate, in that order, without being put out.

A standard baseball roster fields nine defensive players at a time: a pitcher, a catcher, four infielders, and three outfielders. Teams carry larger rosters, often 26 players at the Major League level, so players can be substituted throughout a game or season.

A regulation professional baseball game consists of nine innings. Each inning is split into a top half, when the visiting team bats, and a bottom half, when the home team bats. Youth and amateur leagues sometimes play shorter games of six or seven innings.

Most Major League Baseball games last around two and a half to three hours, though the introduction of the pitch clock in 2023 has shortened the average game time closer to two hours and forty minutes. Games can run longer if they go into extra innings.

A home run occurs when a batter hits the ball over the outfield fence in fair territory, allowing the batter to circle all four bases and score a run without stopping. It is one of the most exciting plays in baseball and instantly counts as a run for the batting team.

An out is a way of removing a batter or base runner from play, and it takes three outs to end a half-inning. Common ways to make an out include a strikeout, a fly ball caught by a fielder, a ground ball thrown to first base before the runner arrives, or tagging a runner who is not touching a base.

Baseball and softball share the same basic structure but differ in details: softball uses a larger, softer ball, a smaller field, an underhand pitching motion, and typically seven-inning games instead of nine. Softball is also more commonly played at the youth, school, and women's competitive levels, though both sexes play both sports.

Two teams alternate between batting and fielding across nine innings. The pitcher throws the ball toward home plate, the batter tries to hit it into fair territory, and the batting team advances runners around the bases to score runs while the fielding team tries to record three outs per half-inning.

A strike is called when the batter swings and misses, hits a foul ball with fewer than two strikes already, or takes a pitch that passes through the strike zone without swinging. Three strikes result in a strikeout, which is an out.

A ball is a pitch that misses the strike zone and the batter does not swing at it. If a pitcher throws four balls to the same batter before recording three strikes, the batter is awarded first base on a walk.

A walk, officially called a base on balls, happens when a pitcher throws four pitches outside the strike zone to the same batter without the batter swinging. The batter is then awarded first base automatically.

A strikeout occurs when a batter accumulates three strikes during a single at-bat, whether by swinging and missing, taking a called strike in the zone, or fouling off a pitch with two strikes already. It results in an out for the batting team.

A foul ball is any batted ball that lands outside the foul lines running from home plate through first and third base. A foul ball counts as a strike unless the batter already has two strikes, in which case it typically does not add a third strike, except on a bunt attempt.

Once the fielding team records three outs, the half-inning ends immediately. The two teams switch roles: the team that was batting takes the field, and the team that was fielding comes up to bat.

If the score is tied after the regulation nine innings, the game continues into extra innings, where teams keep playing additional full innings until one team leads at the end of a complete inning. Some levels of baseball use special rules, such as placing a runner on second base to start extra innings, to help resolve the game more quickly.

A mercy rule, also called a run-rule, ends a game early when one team leads by a large margin, commonly ten runs after a set number of innings. It is mostly used in youth, amateur, and international baseball to avoid one-sided games running to full length.

A balk is an illegal motion by the pitcher that is judged to deceive base runners, such as starting a pitching motion and stopping partway through. When a balk is called, all base runners are automatically advanced one base.

The infield fly rule applies when there are runners on first and second base, or the bases are loaded, with fewer than two outs, and the batter hits a fair fly ball that an infielder can catch with ordinary effort. The umpire immediately declares the batter out, which prevents infielders from intentionally dropping the ball to turn an easy double play on the runners.

The designated hitter, or DH, is a player who bats in place of the pitcher without playing a defensive position. Since 2022, both the American League and National League in MLB use the designated hitter, though many amateur and international leagues still have their own variations.

The nine standard positions are pitcher, catcher, first baseman, second baseman, third baseman, shortstop, left fielder, center fielder, and right fielder. Each is numbered one through nine for scorekeeping purposes, which is why you will see plays recorded like 6-4-3 for a shortstop-to-second-to-first double play.

The pitcher throws the ball from the pitcher's mound toward home plate, trying to get the batter out through strikeouts or weakly hit balls. Pitchers also field balls hit near the mound and hold base runners close to their bases to prevent stolen bases.

The catcher crouches behind home plate to receive pitches, calls pitch signals to the pitcher, and blocks pitches in the dirt to keep runners from advancing. Catchers also make plays at home plate and throw out runners attempting to steal a base.

Infielders, which include the first baseman, second baseman, third baseman, and shortstop, play close to the bases on the dirt infield and handle quickly hit ground balls. Outfielders, positioned in left, center, and right field on the grass, cover the deeper part of the field and handle fly balls and hits that get past the infield.

A relief pitcher enters the game after the starting pitcher is removed, typically to pitch one or more innings later in the game. Relief pitchers often specialize in specific roles, such as pitching only the seventh or eighth inning.

A closer is a relief pitcher whose primary role is to pitch the final inning of a game when the team is leading by a small margin, in order to secure a save. Closers are usually a team's most reliable reliever under pressure.

A utility player is someone who can competently play multiple positions, often filling in wherever the team needs on a given day. Utility players add flexibility to a roster and frequently appear as late-game substitutes.

Yes, a manager can move a player to a different position at any point as long as the substitution rules are followed, and players are often shifted between innings. However, once a player is removed from the game entirely, they cannot return in most levels of baseball.

In Major League Baseball, the distance between each base is 90 feet, and the distance from the pitcher's mound to home plate is 60 feet 6 inches. Outfield distances vary by ballpark, but fences are commonly somewhere between 310 and 400-plus feet from home plate.

The pitcher's mound is a raised circular area of dirt in the center of the infield where the pitcher stands to deliver pitches. In MLB, the mound sits 10 inches higher than home plate and includes a rubber slab, called the pitching rubber, that the pitcher must contact during the pitching motion.

Home plate is a five-sided slab of whitened rubber, roughly 17 inches wide on the side facing the pitcher, that marks where a batter stands and where runners must touch to score. Its unique shape helps umpires and players clearly judge the edges of the strike zone.

At minimum, a player needs a glove for fielding, a bat for hitting, and a batting helmet for protection at the plate and on the bases. Catchers require additional protective gear, including a mask, chest protector, and shin guards, since they face repeated impacts from pitches.

The strike zone is the area directly above home plate, roughly between the batter's knees and the midpoint of their torso, through which a pitch must pass to be called a strike if the batter does not swing. The exact height varies slightly from batter to batter based on their individual stance.

Most professional wood bats weigh between 31 and 34 ounces, though this varies by player preference and league rules. Amateur and youth leagues often use aluminum or composite bats, which have their own weight and length regulations.

A batting helmet is hard protective headgear worn by batters and base runners to guard against being struck by a pitched or thrown ball, which can travel over 90 miles per hour. Helmets are mandatory at essentially every level of organized baseball for safety reasons.

Foul territory is the area of the field outside the foul lines that extend from home plate through first and third base into the outfield. Balls that land in foul territory, or that a fielder catches while standing in foul territory, are generally ruled foul or a foul-ball out, depending on the situation.

A team scores one run every time a base runner legally advances around all four bases, from first to second to third and finally across home plate, without being put out. The team with the most total runs at the end of the game wins.

A run is the basic scoring unit in baseball, credited whenever a player completes the circuit of all four bases and touches home plate safely. Runs are the only thing that determines the winner of a game.

An RBI is credited to a batter whenever their action at the plate, such as a hit, walk with the bases loaded, or sacrifice fly, directly causes a run to score. RBIs are used to measure how effective a hitter is at driving in teammates.

Batting average measures how often a player gets a hit per official at-bat, calculated as hits divided by at-bats and expressed as a three-digit decimal, such as .300. A batting average around .300 or higher is generally considered excellent at the professional level.

ERA measures how many earned runs a pitcher allows per nine innings pitched, calculated by dividing earned runs by innings pitched and multiplying by nine. A lower ERA indicates a more effective pitcher, with anything under 3.00 typically considered very strong.

A home run is simply a ball hit over the fence in fair territory that lets the batter score, regardless of how many runners are on base. A grand slam is a specific type of home run hit with the bases loaded, meaning it scores four runs at once, the maximum possible on a single play.

An error is a mistake by a fielder, such as a dropped catch or a bad throw, that allows a batter or runner to reach a base or advance further than they should have. Errors are recorded separately from hits and do not count against a batter's batting average.

OPS combines a player's on-base percentage, how often they reach base, with their slugging percentage, which measures the power of their hits, into a single number. It is widely used as a quick, well-rounded snapshot of a batter's overall offensive value.

A no-hitter is a game in which a pitcher, or combination of pitchers, does not allow the opposing team a single hit over the entire game. A perfect game is an even rarer version of a no-hitter in which no opposing batter reaches base at all, whether by hit, walk, error, or any other means.

The bullpen refers to both the area where relief pitchers warm up before entering a game and, informally, the group of relief pitchers on a team's roster. It is usually located beyond the outfield fence or down the foul line.

The dugout is the sheltered bench area along the foul lines where players, coaches, and managers sit when they are not on the field. It provides a close-up view of the action and a place to store equipment during the game.

A double play is a defensive sequence in which the fielding team records two outs on the same continuous play, most commonly a ground ball fielded and thrown to force one runner before the throw to first base beats the batter. It is one of the most valuable defensive plays because it can end an inning in a single at-bat.

A triple play records three outs on a single continuous play, making it one of the rarest events in baseball. It usually requires unusual circumstances, such as multiple runners on base and a sharply hit ball caught and relayed perfectly by the defense.

Stealing a base means a runner advances to the next base while the pitcher is delivering a pitch, without the ball being hit, relying on speed and timing rather than a batted ball. The catcher can attempt to throw the runner out at the base they are stealing.

A bunt is a batting technique in which the batter holds the bat still and lightly taps the pitch, rather than swinging fully, to place the ball a short distance in the infield. Bunts are often used strategically to advance a runner or to catch the defense off guard with a surprise hit.

A pinch hitter is a substitute batter who replaces another player in the batting lineup, usually to gain a tactical advantage, such as facing a pitcher the substitute matches up well against. Once a pinch hitter enters, the player they replaced is finished for the rest of the game.

Batting cleanup refers to hitting in the fourth spot in the batting order, traditionally reserved for a team's best power hitter. The nickname comes from the idea that the cleanup hitter often drives in, or cleans up, any runners already on base.

A walk-off win happens when the home team takes the lead in the bottom of the final inning, ending the game immediately because the visiting team has no more chances to bat. It is called a walk-off because the losing team must simply walk off the field once the winning run scores.

MLB, Major League Baseball, is the top professional baseball league in North America and widely regarded as the highest level of competition in the sport. It is made up of two leagues, the American League and National League, that together crown a champion each year through the World Series.

MLB currently has 30 teams, split evenly between the American League and the National League, with 15 teams in each. Each league is further divided into East, Central, and West divisions.

Minor League Baseball is a system of professional development leagues, organized in tiers such as Triple-A, Double-A, High-A, and Single-A, where players develop their skills before potentially reaching MLB. Nearly every MLB organization operates its own network of affiliated minor league teams.

The World Series is the annual championship series of Major League Baseball, played between the champions of the American League and the National League. It is contested in a best-of-seven format, with the first team to win four games declared the champion.

The World Baseball Classic, often abbreviated WBC, is an international tournament featuring national teams from around the world, including many active MLB players representing their home countries. It is held periodically and is one of the sport's premier events for showcasing global talent outside of the Olympics.

The WBSC is the international governing body that oversees baseball and softball worldwide, including organizing world championships and coordinating Olympic qualification. National federations across dozens of countries operate under its rules and sanctioning.

Baseball has appeared in the Olympics on and off over the decades and is scheduled to return for the 2028 Los Angeles Games alongside softball. Its Olympic status has historically depended on host-city voting, since it is not a permanent fixture on the Olympic program.

College baseball is competitive baseball played by university teams, most notably in the United States through the NCAA, and serves as a major pathway for players heading toward professional careers. The College World Series is the sport's premier annual college championship event.

Little League is one of the largest and best-known youth baseball and softball organizations in the world, serving children roughly ages 4 through 16 across many countries. Its annual Little League World Series, held in Williamsport, Pennsylvania, is broadcast internationally and introduces many young fans to the sport.

Baseball evolved gradually from earlier bat-and-ball games played in England and North America during the 18th and 19th centuries, rather than being invented in a single moment. The modern set of rules is most closely associated with codification efforts in the United States during the mid-1800s.

Alexander Cartwright is frequently credited as a key figure in formalizing early baseball rules in the 1840s, including concepts like foul lines and the diamond-shaped infield still used today. Historians generally agree the sport developed through many contributors rather than a single inventor, despite the popular myth crediting Abner Doubleday.

The National League, founded in 1876, is the oldest continuously operating professional baseball league still in existence and now forms one half of Major League Baseball alongside the American League, founded in 1901.

Baseball earned the nickname America's pastime because of its deep cultural roots in the United States dating back to the 19th century, its widespread popularity across generations, and its long-standing traditions tied to American communities, media, and holidays.

Yes, baseball has strong followings in countries such as Japan, South Korea, Cuba, the Dominican Republic, Venezuela, Mexico, Taiwan, and increasingly across Europe, including growing leagues in nations like the Czech Republic and the Netherlands. Many of these countries produce top talent that goes on to play in MLB.

The longest professional game by innings was played in 1981 between the Pawtucket Red Sox and Rochester Red Wings, lasting 33 innings over more than eight hours before it was completed. By time alone, several MLB games have stretched past seven or eight hours due to extra innings and lengthy pitching changes.

A baseball scoreboard typically lists each inning across the top with the runs scored by each team in that inning listed below it, plus season totals for runs, hits, and errors on the far side. Reading it inning by inning shows you exactly when each team scored during the game.

R stands for runs, the total scored by each team; H stands for hits, the total number of times each team's batters safely reached base on a batted ball; and E stands for errors, the number of defensive mistakes charged to either team. Together they give a quick statistical summary of the whole game.

A box score is a detailed statistical summary of a completed game, showing each player's individual performance, including at-bats, hits, runs, RBIs, and pitching statistics. Box scores let fans review exactly how a game unfolded without needing to have watched it live.

Baseball is traditionally an untimed sport because the game is structured around outs rather than minutes, meaning a team simply keeps batting until it records three outs, regardless of how long that takes. MLB has since introduced a pitch clock to speed up pace of play, but the game itself still ends based on innings and outs, not a running clock.

The seventh-inning stretch is a traditional break between the top and bottom of the seventh inning where fans stand up, stretch, and often sing along to songs like 'Take Me Out to the Ballgame.' It is one of baseball's most beloved and enduring in-game traditions.

The top of the inning refers to the visiting team's turn at bat, while the bottom of the inning refers to the home team's turn at bat. This order also means the home team always bats last, which is why home-field advantage can matter in close games.

Pick one team to follow closely, whether based on your city, country, or a favorite player, and watch or follow their games regularly. Understanding the flow of a single team's season is a natural way to absorb strategy, rules, and player storylines over time.

No, you can enjoy baseball with just the basics, such as balls, strikes, outs, and how runs are scored, and pick up finer details like the infield fly rule or balk calls naturally as you watch more games. Most longtime fans built their knowledge gradually rather than memorizing the rulebook up front.

Baseball is broadcast through a mix of national and regional television networks, official league streaming services, and local broadcast partners, depending on your country and the level of baseball you want to follow. Many leagues also offer condensed game replays and highlights for fans who cannot watch live.

Following dedicated baseball news sites, official league apps, and box scores is the fastest way to keep up with scores, standings, and storylines. World Baseball News, at worldbaseballnews.org, covers baseball from around the globe, making it a useful starting point for fans who want coverage that goes beyond a single league or country.