HIV, or Human Immunodeficiency Virus, is a type of virus called a retrovirus that destroys the body's immune system by destroying CD4 positive (CD4+) T cells (It is the type of white blood cells which fights against the infection). HIV and AIDS are not the same. If HIV is not treated for many years, then the final stage of it is called as AIDS (Acquired Immunodeficiency Syndrome).However a person infected with HIV may not necessarily progress to having AIDS.
HIV infection and AIDS are serious diseases, but there are treatments available to prevent the illness, as well as manage the symptoms once they develop. It is important to visit the doctor regularly to know about the status of the progress in treatment.