The Canadian Football League (CFL) boasts a rich heritage that predates its formal establishment. Its roots trace back to the late 19th century with the introduction of rugby football to Canada. Over decades, the game evolved distinctly from its American counterpart, with various regional leagues forming and competing. The formal structure we recognize today began to solidify in the mid-20th century. The Interprovincial Rugby Football Union (IRFU) and the Western Interprovincial Football Union (WIFU) were pivotal in this development, eventually merging to form the CFL in 1958. This unification marked a significant milestone, professionalizing the sport and setting the stage for national competition under a unique set of rules.

One of the most striking differences between Canadian and American football lies in the number of downs. CFL teams are granted three downs to advance the ball ten yards, as opposed to four in the NFL. This fundamental rule often leads to more aggressive play-calling and a greater emphasis on passing. Furthermore, the playing field itself is larger in Canada, measuring 110 yards between the goal lines and 65 yards wide, compared to the NFL's 100x53.3 yards. The end zones are also deeper at 20 yards. Another unique aspect is the allowance for all offensive backfield players to be in motion towards the line of scrimmage before the snap, adding a dynamic element to offensive strategies.

Scoring in the CFL shares similarities with American football, including touchdowns (6 points), field goals (3 points), and safeties (2 points). However, a distinctive element is the "rouge" or single point. This occurs when the ball is kicked into the opponent's end zone and they fail to return it out, or if it goes out of bounds in the end zone after a kick. The receiving team can avoid a rouge by running the ball out of the end zone. Additionally, the concept of a fair catch, common in American football where a player can signal for a free catch without being tackled, is absent in the CFL. Players must either attempt to advance the ball or concede a score.

The CFL implements specific rules regarding player rosters, notably the "Canadianization" rule. Teams are required to maintain a certain quota of Canadian-born players on their active rosters, fostering domestic talent and ensuring a national identity for the league. This policy influences team building and scouting strategies. Financially, the league operates with a comparatively modest salary cap compared to its American counterpart, which impacts player salaries and the overall economic scale of the sport. These structural differences contribute to a faster, more open style of play, often characterized by higher scoring and more intricate offensive formations due to the larger field and motion rules.

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