International alliances are significant in politics because they enhance diplomatic relations, security cooperation, and economic collaboration among member states. These alliances, such as NATO or the European Union, enable countries to collectively address global challenges, from military threats to economic instability. By sharing resources and intelligence, nations can bolster their security and influence on the world stage. Additionally, alliances can shape international norms and policies, establishing frameworks for cooperation. Ultimately, international alliances play a crucial role in maintaining peace and stability while fostering mutual interests among nations.