A federal judge has ruled that Google must make significant changes to its Android app store, following an antitrust case brought by Epic Games. The court mandated that Google open its Play Store to rival app stores and allow alternative payment methods, marking a historic shift in the mobile app ecosystem. This decision comes after a series of legal challenges highlighting Google's dominance in the market. The ruling is expected to facilitate competition among app stores on Android, changing how users access and purchase apps. Google's efforts to appeal the decision indicate ongoing legal battles and the potential for further regulatory scrutiny.