Actually .. HIV is the virus that causes AIDS.
H - Human: because this virus can only infect human beings. I - Immuno-deficiency: because the effect of the virus is to create a deficiency, a failure to work properly, within the body's immune system. V - Virus: because this organism is a virus, which means one of its characteristics is that it is incapable of reproducing by itself. It reproduces by taking over the machinery of the human cell. A - Acquired: because it's a condition one must acquire or get infected with; not something transmitted through the genes I - Immune: because it affects the body's immune system, the part of the body which usually works to fight off germs such as bacteria and viruses D - Deficiency: because it makes the immune system deficient (makes it not work properly) S - Syndrome: because someone with AIDS may experience a wide range of different diseases and opportunistic infections.