The HIV transfer from one person to another person called HIV transmission. HIV mainly transmits through blood, rectal fluids, vaginal fluids, semen. HIV is transfer mainly by having sex or distribution injection drug equipment, such as needles, with someone who has HIV. Some people were infected with HIV after receiving a blood transfusion or organ transplant from an HIV-infected donor. HIV also transfer from HIV infected mother to child it is called as mother to child transmission.