Imperialism refers to the policy of extending a nation's authority over foreign territories or people. It has historically been used to justify acquiring lands and asserting political and economic dominance. There are varying degrees of imperialism from direct colonial rule to weaker forms like neo-colonialism. Motives for imperialism include economic gains, prestige, security, and surplus population adjustment. While it provided some benefits like development, imperialism is ultimately seen as inherently exploitative, undemocratic, and a violation of human rights. Decolonization movements have succeeded in dismantling some traditional forms of imperialism and colonial rule.