Lacrosse is a team sport played with a lacrosse stick and a lacrosse ball. It is the oldest organized sport in North America, with its origins in aboriginal Canada as early as the 17th century. The game was extensively modified by colonizers, reducing the violence, to create its current collegiate and professional form.

Players use the lacrosse stick to handle the ball and to strike or "check" opposing players' sticks, causing them to drop the ball. The head of a lacrosse stick is roughly triangular in shape and is strung with loose netting that allows the ball to be caught, carried (known as "cradling"), passed, or shot.

In the traditional aboriginal Canadian version, each team consisted of about 100 to 1,000 men on a field several miles (several kilometers) long. These games lasted from sunup to sundown for two to three days straight and were played as part of ceremonial ritual, a kind of symbolic warfare, or to give thanks to the Creator or Master.

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