AIDS is widely accepted acronym. It stands for Acquired Immune Deficiency Syndrome. AIDS is a serious disease which is caused by a disease named HIV.
HIV is a virus that stands for Human Immunodeficiency Virus.
Note: You cannot write or say ‘HIV Virus’.
HIV Virus = Human Immunodeficiency Virus Virus (Wrong)
HIV = Human Immunodeficiency Virus (Correct)
These two diseases cannot be interchangeable. HIV and AIDS are two different diseases. You cannot mixed them up.
Unlike the other viruses like common flu or cold, HIV is such a dangerous virus that remains and never go away. A person with this particular virus, slowly and gradually, becomes severely ill; as this disease badly weakens a person’s immune system. When a person’s immune system becomes so weakened by HIV, then he or she will then diagnosed with AIDS.
Hence, HIV and AIDS are two totally different diseases. You can name AIDS as advanced HIV disease.