What does it mean in football when you keep possession?

Answer 1

keeping possesion is that your team has the ball and has it under control

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Possession of the ball is of critical importance in a football game. A team can lose possession of the ball through a fumble recovered by the opposing team, a pass intercepted by the opposing team, by punting the ball to the opposing team, or by failing to advance the ball ten yards in three plays from scrimmage. Keeping possession occurs, for example, when a team recovers its own fumble, when a pass originally ruled an interception is overruled on a replay, when a penalty against the opposing team nullifies a turnover, etc.