Alliances in international politics serve as crucial strategic partnerships that enhance cooperation among nations. They can deter aggression through collective security, promote economic ties, and influence global power dynamics. Alliances like NATO or the EU strengthen member states by creating a unified front against external threats. Additionally, they shape diplomatic negotiations, economic policies, and military strategies. In an increasingly multipolar world, the effectiveness and legitimacy of alliances face challenges, requiring adaptation to new global realities. Overall, alliances remain pivotal in addressing transnational issues and enhancing stability.