There are many rules to the NFL buut only a few are commonly abused. There have been books written for all tipes of football leages, so I suggest going out and buying a book.
You'll have to be more specific about your question. By the the way you framed your question I would have to assume that you are asking the difference between professional (American) football rules...
The officials of Football and futsal. (REFEREES)are there to uphold the laws of the game - there are no rules they are laws.the officials are there to make sure that there is no misconduct and to...