Predators play a crucial role in maintaining ecosystem balance by controlling the population of prey species. By preying on herbivores, predators help prevent overgrazing, which can lead to habitat degradation and a decline in plant species diversity. This, in turn, helps maintain a healthy ecosystem where various species can coexist in balance. Additionally, predators can also help regulate the population of other predators, creating a complex web of interactions that contribute to the overall stability of the ecosystem.