Billiards is considered a target game because the objective is to score points by accurately hitting the cue ball into the other balls on the table and pocketing them into the designated pockets. Players must aim carefully and use skill and precision to achieve their goal of scoring points. The game involves targeting specific balls on the table and strategically deciding where to aim in order to successfully pocket them. Thus, billiards is classified as a target game due to the focus on accuracy and precision required to play.