The Official Rules of Major League Baseball is a set of rules set forth by the MLB governing the playing of baseball games by professional teams of Major League Baseball and the leagues that are members of the National Association of Professional Baseball Leagues.
The rules specify the equipment used[1][2] and its care and preparation,[3] the layout of the playing field, the details of game play,[4] and the expected behavior of the players.
[5] The rules are also used by many amateur leagues, although in these cases, the monetary fines and other such stipulation are usually considered impractical and disregarded.
The 2017 edition occupies 163 and 99 pages in the current and 2014 formats, respectively.
[6] In recent years the rules have also been posted online.