Football, in fact, is a regular betting favorite for most sports bettors. That is why football can be found on every betting platform. And you can place bets on its games from there.
A sportsbook is the same thing as a bookmaker or bookie: It's a company or individual that accepts bets from individual sports bettors. Sportsbooks accept bets on either side of a sporting event. They're able to afford to do this because of the difference between what a bettor has to wager and what a bettor wins.