College football is American football played by teams of student athletes fielded by American universities, colleges, and military academies, or Canadian football played by teams of student athletes fielded by Canadian universities.
Canadian football is a form of gridiron football played in Canada in which two teams of 12 players each compete for territorial control of a field of play 110 yards long and 65 yards wide attempting to advance a pointed prolate spheroid ball into the opposing team's scoring area.
American football, referred to as football in the United States and Canada, and also known as gridiron, is a sport played by two teams of eleven players on a rectangular field with goalposts at each end.
Oklahoma vs Baylor Week 11 College Football 2015 / 11.14.2015 by College Football Fans
It was through college football play that American football rules first gained popularity in the United States.
Ohio State vs Rutgers Full Game 24/10/2015 College Football by College Football Fans
Therefore, college football is generally considered to be the second tier of American football in the United States; one step ahead of high school competition, and one step below professional competition.
It is in college football where a player's performance directly impacts his chances of playing professional football.
The best collegiate players will typically declare for the professional draft after 3 to 4 years of collegiate competition, with the NFL holding its annual draft every spring.