Birleşmiş Milletler, or the United Nations, is an international organization founded in 1945. Its main purpose is to promote peace, security, and cooperation among countries. The organization consists of 193 member states and works on various global issues, including human rights, development, and humanitarian aid. The United Nations operates through different agencies, such as the World Health Organization (WHO) and the United Nations Children's Fund (UNICEF). These agencies focus on specific areas to improve the well-being of people worldwide. The UN also plays a crucial role in addressing challenges like climate change and conflicts between nations.