Ultimate Frisbee is more than just a backyard game of toss or a middle school gym activity. It is an international and rapidly growing sport with high school state and national championships, extremely competitive intercollegiate tournaments and national championships, high-level club divisions, and even a professional league - the American Ultimate Disc League (AUDL). Nearly all official United States related Ultimate activities, tournaments, and programs (With the exception of the AUDL) are sanctioned through a governing body called United States of America Ultimate (USAU). For a much more in depth analysis of the history of Ultimate, it's current status nationwide, in addition to a full explanation of the rule book, please visit the official USAU website.
The actual game of Ultimate in a nutshell resembles a cross between soccer and football. Each team plays with 7 athletes on the field at a time and the goal is to catch a pass in the end-zone for a score. The spacing, running, and general flow of the game resembles that of a soccer match, while the rout running, throwing, and catching resemble plays from quarterbacks and receivers in football. The biggest standout aspect unique to Ultimate is that the sport is completely self-officiated. Each member of the team is responsible for maintaining high character, sportsmanship, and fairness by assessing accurate foul calls or any other rule infractions. This has lead to a sport where bad sportsmanship is a rarity, even in the most intense and competitive of games.