Major League Baseball (MLB) is the top professional baseball league in the US and one of the oldest sports leagues in the world. Famous for its rich history, legendary players and passionate fans, MLB is an integral part of American sports. With 30 teams split between the American and National Leagues, MLB brings exciting games, historic rivalries and unforgettable moments every season. Whether you’re new to the game or a seasoned fan, understanding MLB opens the door to one of the most popular sports in the world.
What is MLB? A Complete Guide to Major League Baseball in the USA
Major League Baseball (MLB) is one of the most iconic and historic sports leagues in the US. Loved by millions of fans around the world, MLB is the highest level of professional baseball in North America. Whether you’re a lifelong baseball fan or a curious newcomer, this article will give you a complete rundown of MLB, its structure, history and importance.

A Brief History of MLB Major League Baseball
MLB was formed in 1903 after the merger of two rival leagues: the National League (NL) and the American League (AL). Since then baseball has become a sport that’s deeply embedded in American culture.
MLB has its roots in the 19th century, with the first professional team, the Cincinnati Red Stockings, formed in 1869. The National League (NL) was established in 1876, the American League (AL) in 1901. These two leagues ran separately until 1903 when they agreed to work together and started the World Series which became MLB’s championship event.
Over the years MLB grew in popularity and expanded across the US. It was a big part of American life, including the historic breaking of the color barrier by Jackie Robinson in 1947, the first African-American to play in the major leagues.
Today MLB has 30 teams and is known for its ballparks, legendary players like Babe Ruth and Hank Aaron and its impact on global baseball. MLB is one of the most historic and respected sports leagues in the world.
MLB League Structure
MLB is divided into two main leagues:
- American League (AL)
- National League (NL)
Each league has 15 teams, making 30 teams in total. The teams are further divided into three divisions: East, Central and West.
Season Format
- Regular Season: Each team plays 162 games from April to September.
- Postseason (Playoffs): In October, it includes Wild Card games, Division Series, League Championship Series and finally the World Series.
Top Teams
The most popular and successful teams are:
- Yankees
- Dodgers
- Red Sox
- Cubs
- Giants
Why MLB is Awesome
- History: Babe Ruth, Jackie Robinson, Derek Jeter and more made MLB what it is today.
- Rivalries: Yankees vs. Red Sox is the biggest rivalry in sports.
- Events: From Opening Day to the World Series there’s something every season.
Digital and Global Major League Baseball
MLB has gone digital with online streaming, fantasy baseball and international games so it’s more accessible than ever.
In today’s world Major League Baseball has gone beyond the ballpark and TV screen. Digital innovation and global outreach has never been bigger.
**Digital
MLB has gone tech with:
- MLB.TV – Live and on-demand games worldwide.
- MLB app – Real-time scores, highlights and updates.
- Fantasy Baseball – Interactive gaming and analytics for fans.
- Social Media – We’re on YouTube, Instagram, Twitter and TikTok and reach millions of younger fans daily.
**Global
MLB is going global through:
- International Games – Games in London, Mexico and Japan to connect with fans worldwide.
- Global Stars – Players from Japan, the Dominican Republic and South Korea are household names.
- Worldwide Broadcasting – MLB games are televised in over 200 countries and we’re making baseball a global sport.
FAQ’S About MLB Major League Baseball
Q1: How many teams are in MLB?
many teams?
A: There are 30 teams—15 in the American League and 15 in the National League.
Q2: When does the MLB season start and end?
A: The regular season starts in April and ends in September, followed by the postseason in October.
Q3: What is the World Series?
A: The MLB championship series, the World Series, pits the AL and NL winners against one another.
Q4: In World Series history, which team has had the greatest success?
A: The New York Yankees have the most, with 27 World Series wins.
Q5: Can I watch MLB games online?
A: Yes, MLB games are available on platforms like MLB.TV, ESPN, and Fox Sports.