A concentration camp (or internment camp) is a place where a government forces many people to live. Usually, those people belong to groups that the government does not like. The government may think these people are its enemies. In the past, governments have also put people in concentration camps because they belonged to a certain religion, race, or ethnic group.
Usually, people are sent to concentration camps without having a trial or being found guilty of a crime.
Sometimes, governments send people to concentration camps to do forced labor or to be killed. For example, the best-known concentration camps were run by Nazi Germany during World War II. The Nazis used concentration camps to kill millions of people and force many others to work as slaves. However, many other countries have used concentration camps during wars or times of trouble.

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