A concentration camp is a prison or other facility used for the internment of political prisoners or politically targeted demographics, such as members of national or ethnic minority groups, on the grounds of national security, or for exploitation or punishment. Prominent examples of historic concentration camps include the British confinement of non-combatants during the Second Boer War, the mass internment of Japanese-Americans by the US during the Second World War, the Nazi concentration camps (which later morphed into extermination camps), and the Soviet labour camps or gulag. Source: Wikipedia (en)