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HIV stands for Human Immunodeficiency Virus (say: ih-myoo-nuh-dih-fih-shun-see). AIDS stands for Acquired Immunodeficiency Syndrome. HIV is actually the virus that causes the disease AIDS. To understand AIDS formation process, we need to know what an Immune System is (say: ih-myoon). Every person has body protective system.
HIV is the virus which attacks the T-cells in the immune system. AIDS is the syndrome which appears in advanced stages of HIV infection. HIV is a virus. AIDS is a medical condition.