American Fantasy Football is such a game where "owners" (so-called participants) each acquire or draft through auction a real-life NFL team (it is can be even college team, that is depending on the division) players and then gain points and those scoring is based on statistical performance of those players on the field.
Conferences and divisions can be agreed in which the champion is the club which (at the end of the season) has the most total points or in the way of a "head-to-head format" (which represents the real National Football League) where every week each team faces against a single opponent, and the team which has the best win-loss record at the end of the year wins the league title. Many leagues set sideways their last weeks of the National Football League regular season with the purpose to set their own playoffs.
It is very interesting fact that, American Fantasy football became from a simple spare time activity into a huge business industry because of the Internet in recent years. Fantasy sports generally became to a field of industry that generates an expected $100 million in yearly income and about 30 million Americans are involved into that game, according to a Harris Interactive poll. The popularity of fantasy football was lower that fantasy baseball popularity earlier, but now fantasy football popularity has surpassed baseball in such a way became to the most popular fantasy sport in Canada and the USA. Moreover, it is continuing to develop: the number of magazines, websites and program software devoted to American fantasy football has enlarged significantly in each of the recent years.
Normally, a fantasy football rules are similar to the real game and that's why league involves eight to twelve clubs, which allocate players of National Football League among themselves by holding an auction or draft before the season start. Mainly leagues are "re-draft" leagues or divisions where each club begins new regular season with an empty squad to be filled via auction or draft. It is very interesting fact that as a rule the drafts are held in fashion of serpentine; i.e., the club which picks first in the odd rounds should in the even rounds pick last.
Several leagues, nevertheless, are "keeper" leagues where owners can choose a certain players number (as many as five, but sometimes just one) to keep on their squad from the last season, by the method of removing players from the annual auction. Other "dynasty" leagues have another rule: the owner keeps his complete squad from the last season (or as a minimum the huge majority), with the annual draft that is consisted only of rookie (new) players.
Players in American fantasy football, who were not drafted, become players with free agents status which means that they are not on a current squad of any team. Through the regular season, owners of the teams may modify their team composition either by making deals with other team's owners or by adding players from free agents pool (and removing a corresponding player's number from their squads, after that those players become free agents).
Thus, there are some interesting questions in fantasy sports that were analyzed in this fantasy football description.