Many countries work together. 
Many lands join together to form groups. 
One famous group is the United Nations. It helps many countries talk to each other. These groups follow rules to stay fair. They can also make their own agreements.
Working together makes the world better for everyone.
Countries often join together to reach a common goal. These groups are called international organizations. They are also called intergovernmental organizations, or IGOs. 
An IGO is formed by a treaty. A treaty is a formal agreement between nations. These groups have their own legal personality. This means they can make their own binding deals. Many groups work on specific tasks. Some help with health or trade. Others focus on protecting the environment. Some groups are global. Others are regional and only include nearby lands.
History shows how these groups grew. The Central Commission for Navigation on the Rhine is the oldest. It was founded in 1815. The League of Nations was the first group for many issues. It started in 1920 to help keep peace. After World War II, the United Nations was formed. It was signed in 1945. Today, there are many different types of IGOs. Some help with money, like the World Bank. Others help with culture or language. These groups help nations work together more easily.
International organizations help different countries work together. These groups are often called intergovernmental organizations, or IGOs. They are formed when many nations sign a treaty. A treaty is a formal, legal agreement. Once a treaty is signed, the IGO becomes its own legal person. This means the group can make its own binding deals with other groups or countries. 
There are many different kinds of IGOs. Some groups have a global scope and welcome nations from all over. The United Nations is a very famous example of a global group. Other groups are regional. These only include countries from a specific area, like the African Union or the Organization of American States. Some IGOs focus on just one topic. For instance, the World Trade Organization focuses on trade. The World Health Organization works on health issues. There are even groups based on shared culture or language. The Arab League and the Commonwealth of Nations are examples of these. 
History shows us how these groups began. Long ago, the Congress of Vienna in 1814 and 1815 helped change how Europe was run. The oldest organization still working today is the Central Commission for Navigation on the Rhine. It was started in 1815. In 1865, the International Telecommunication Union was founded. This was the first global group to use a treaty and a permanent office. Later, in 1874, the Universal Postal Union was created. These early groups showed that countries could work together on specific tasks like mail or communication. 
After World War I, a new kind of group appeared. The League of Nations was founded on January 10, 1920. Its main goal was to keep world peace. After World War II, the United Nations was created to follow this model. The United Nations was signed on June 26, 1945, in San Francisco. It officially began on October 24, 1945. The UN has many parts, like the Security Council and the General Assembly. The number of IGOs has grown a lot over time. In 1940, there were only about 60 such groups. By 1980, that number grew to about 350. 
Understanding IGOs helps us see how the world stays connected. These groups help solve hard problems like protecting the environment. They also help with economic development and human rights. Some groups, like the International Monetary Fund, focus on money and banking. Others, like INTERPOL, focus on safety and law. Even though countries want to stay independent, they often join these groups to get rewards. They might do this to gain help from others or to avoid being left out. These organizations are a key part of how our modern world functions every day. 
An international organization is a formal association of states. These groups are often called intergovernmental organizations, or IGOs. They are established through a treaty or a similar legal instrument. This treaty acts as a charter for the group. A key feature of an IGO is its legal personality. This means the organization is a legal entity separate from its member states. Because of this, an IGO can enter into legally binding agreements. It can make deals with other IGOs or with individual states.

IGOs help countries cooperate by solving many different problems. They reduce transaction costs, which are the costs of making deals. They also provide important information to all members. By creating focal points for coordination, they help states work together more easily. They also help make commitments more credible. This means when a state makes a promise, others are more likely to believe it. Some states follow IGO decisions for rational reasons. They want to gain rewards from future cooperation. Other states follow them for normative reasons, which involves social learning and socialization.
These organizations are not all the same. They vary in many ways. Some have inclusive membership, while others are exclusive. Some have a broad scope, covering many topics. Others have a narrow scope, focusing on just one thing. Control can be equal among members or unequal. Rules can be precise or flexible. Obligations can be hard, meaning they are strictly required, or soft. IGOs also differ in how much power they hold from their members. Some are simple groupings or coalitions, like the G7. However, IGOs are different because they are founded by a formal document.

History shows how these groups evolved over time. The Congress of Vienna in 1814–1815 was an early diplomatic conference. It aimed to reorganize the European political order. The Central Commission for Navigation on the Rhine was founded in 1815. It is the world's oldest international organization still in operation. In 1865, the International Telecommunication Union was founded. This was the first global IGO to use a treaty and a permanent secretariat. The Universal Postal Union followed in 1874. After World War I, the League of Nations was founded on January 10, 1920. Its mission was to maintain world peace.

The United Nations (UN) was created after World War II. It was signed on June 26, 1945, in San Francisco. It officially came into force on October 24, 1945. The UN is a very large organization with many parts. These include the Security Council and the General Assembly. It also includes the International Court of Justice and the Economic and Social Council. The number of IGOs has grown significantly over the last century. In 1940, there were only about 60 IGOs. By 1980, that number had increased to about 350.

There are several distinct types of IGOs. Global organizations are open to nations worldwide. Examples include the World Bank and the World Health Organization. Regional organizations focus on specific areas of the world. The African Union and the North Atlantic Treaty Organization (NATO) are examples. Some groups are based on shared culture or language. The Arab League and the Commonwealth of Nations fall into this category. Economic organizations focus on macro-economic policy. The World Trade Organization and the International Monetary Fund (IMF) work on these issues. Some are even dedicated to education, like the United Nations University.

Understanding IGOs helps us understand how the world is connected. They are a vital part of public international law. They allow for multilateralism, which is when three or more states organize based on common principles. These groups can address many different needs. Some resolve disputes through negotiation. Others promote human rights or environmental protection. They also provide humanitarian aid and support economic development. By working together, states can manage complex issues that no single country could solve alone.
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