European alliances refer to formal agreements between countries in Europe to promote mutual interests, security, and cooperation. Historically, these alliances have played significant roles in shaping the continent's political landscape, especially during events like the World Wars. Key alliances include the Triple Alliance and the Triple Entente, which were formed in the early 20th century. In modern times, alliances such as the European Union (EU) and the North Atlantic Treaty Organization (NATO) focus on economic collaboration and collective defense. These organizations aim to foster stability, peace, and prosperity among member states, addressing challenges like security threats and economic crises.