Field lacrosse is a full contact outdoor sport played with two opposing teams of 10 players each. The sport originated among Native Americans, and the modern rules of field lacrosse were initially codified by Canadian William George Beers in 1867. Field lacrosse is one of three major versions of lacrosse played internationally. The rules of men's lacrosse differ significantly from women's field lacrosse (established in the 1890s). The two are often considered to be different sports with a common root. An outdoor six-a-side version, lacrosse sixes, was established in 2021 and features six players per team, reduced field size, and shorter duration to be conducive for daily tournament play. Another version, indoor box lacrosse (originated in the 1930s), is also played under different rules.
The object of the game is to use a lacrosse stick, or crosse, to catch, carry, and pass a solid rubber ball in an effort to score by shooting the ball into the opponent's goal. The triangular head of the lacrosse stick has a loose net strung into it that allows the player to hold the lacrosse ball. In addition to the lacrosse stick, players are required to wear a certain amount of protective equipment. Defensively the object is to keep the opposing team from scoring and to dispossess them of the ball through the use of stick checking and body contact. The rules limit the number of players in each part of the field. It is sometimes referred to as the "fastest sport on two feet".