Under 2.5 is a popular betting market in sports, particularly in soccer, where bettors wager on whether the total number of goals scored in a match will be less than 2.5. This means that for a winning bet, the game must end with either no goals or just one goal scored. It appeals to those who anticipate a defensive match or low-scoring teams. Understanding team form, player injuries, and historical matchups can enhance the chances of success in this betting strategy, making it a favorite among cautious bettors.