Weight classes in boxing are significant for ensuring fair competition among fighters of similar size and weight. This system helps to prevent mismatches that could lead to imbalances in strength or reach, which could cause serious injury. Each class has specific weight limits, allowing fighters to compete at levels where they can showcase their skills. The classification also allows fighters to build their careers strategically, as moving up or down in weight can impact matchups and championship opportunities. Overall, weight classes play a vital role in the sport's structure.