The United Nations (UN) is a big group of countries that work together to make the world better. One of the ways they try to do this is by sending soldiers to places where there is fighting or where people are being treated badly. They call this "peacekeeping."
The idea of peacekeeping came about after World War II, when countries wanted a way to prevent future wars. The UN was created in 1945 and its first peacekeeping mission was sent to the Middle East in 1948 to help stop a conflict between Israel and its Arab neighbors.
Since then, the UN has sent peacekeeping missions to many places around the world, from Africa to Asia to Europe. When a country asks for help, the UN sends peacekeepers who can be soldiers, policemen, or other experts who can help keep peace and make sure people are safe.
Peacekeepers wear blue helmets and are there to help people, not fight with them. They help protect civilians and make sure everyone has enough food, water, and medical care. They also make sure that human rights are respected, which means that everyone is treated fairly and has the same basic rights.
However, sometimes peacekeeping missions are not successful and conflicts continue. Sometimes peacekeepers are attacked or things go wrong. But the UN continues to try and bring peace to troubled areas around the world through peacekeeping missions.