Human immune deficiency(HIV) is a retrovirus that causes AIDS. The HIV virus is approximately 1/10,000 of a millimeter in diameter and spherical in shape. It consists of an outer coat known as the viral envelope and inner core known as the viral core. The viral core consists of viral RNA and enzymes i.e. reverse transcriptase, protease, and integrase. HIV causes the breakdown of the bodies immune system, leaving the body vulnerable to infection.