What is HIV?

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HIV is a virus spread through body fluids that affects specific cells of the immune system, called CD4 cells, or T cells. Over time, HIV can destroy so many of these cells that the body can’t fight off infections and disease. When this happens, HIV infection leads to AIDS.

http://www.cdc.gov/hiv/basics/whatishiv.html

“HIV” stands for Human Immunodeficiency Virus. To understand what that means, let’s break it down:

H – Human – This particular virus can only infect human beings.

I – Immunodeficiency – HIV weakens your immune system by destroying important cells that fight disease and infection. A “deficient” immune system can’t protect you.

V – Virus – A virus can only reproduce itself by taking over a cell in the body of its host.

HIV is a lot like other viruses, including those that cause the “flu” or the common cold. But there is an important difference – over time, your immune system can clear most viruses out of your body. That isn’t the case with HIV – the human immune system can’t seem to get rid of it. That means that once you have HIV, you have it for life.

We know that HIV can hide for long periods of time in the cells of your body and that it attacks a key part of your immune system – your T-cells or CD4. Your body has to have these cells to fight infections and disease, but HIV invades them, uses them to make more copies of itself, and then destroys them. 
Over time, HIV can destroy so many of your CD4 cells that your body can’t fight infections and diseases any more. When that happens, HIV infection can lead to AIDS, the final stages HIV infection.

https://www.aids.gov/hiv-aids-basics/hiv-aids-101/what-is-hiv-aids/

HIV is a virus that attacks the cells and once in the cell they replicate until they spread.

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