Editing Baseball rules (section)

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{{about|the rules of baseball|the tort law rule governing liability for injuries to spectators from foul balls|Baseball Rule}}
[[File:Official_Baseball_Rules_(1921).jpg|thumb|right|Cover of Official Base Ball Rules, 1921 edition, used by the [[American League]] and [[National League (baseball)|National League]]]]
Throughout [[baseball]]'s history, the rules have frequently changed as the game continues to evolve. A few typical rules most professional leagues have in common are that four balls are a [[base on balls]], three strikes are a [[strikeout]], and three outs end a half-[[inning]]. 

Baseball [[Origins of baseball|evolved]] out of [[bat-and-ball games]] in the mid-19th century, and its modern rules are based mainly on [[Knickerbocker Rules|those first published in 1848]].<ref>Thorn, John, ''Baseball in the Garden of Eden: the Secret History of the Early Game''. New York: Simon & Schuster 2011</ref> Most rule sets are generally based on the Official Baseball Rules (OBR) published by [[Major League Baseball]] (MLB), though various minor variations exist from league to league; the [[World Baseball Softball Confederation]] maintains its own official rule set for international competition.<ref name="wbsc">{{cite web |title=Major milestone in international baseball: WBSC unveils Official Rules of Baseball |url=https://www.wbsc.org/en/news/major-milestone-in-international-baseball-wbsc-unveils-official-rules-of-baseball |website=WBSC.org}}</ref>