The rules of baseball

Baseball

Baseball is a bat-and-ball sport played between two teams of nine players each. The aim is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot diamond...

 differ slightly from league to league, but in general share the same basic gameplay.
There are several major rules codes, which differ only slightly.

The "Official Baseball Rules" govern all professional play in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 and Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, including the World Baseball Classic

World Baseball Classic

The World Baseball Classic is an international baseball tournament sanctioned by the International Baseball Federation and created by Major League Baseball , the Major League Baseball Players Association , and other professional baseball leagues and their players associations around the world...

. The complete rules are published as the Official Baseball Rules at MLB.com, the official web site of Major League Baseball

Major League Baseball

Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...

 in the United States and Canada.