Expected Goals (xG) is a statistical measure used in soccer to evaluate the quality of goal-scoring chances. It assigns a value to each shot based on various factors, such as distance from the goal, angle, and the type of play leading to the shot. A higher xG value indicates a greater likelihood of scoring. By analyzing xG, teams and analysts can better understand a player's performance and a team's overall effectiveness in creating scoring opportunities. This metric helps in assessing whether a team is underperforming or overperforming based on the number of goals scored compared to their xG total.