AIDS is an acronym for Acquired Immune Deficiency Syndrome: 
Acquired means you can get infected with it.

Immune Deficiency means a weakness in the body’s system that fights diseases.

Syndrome means a group of health problems that make up a disease. 
This is a picture of HIV. This image represents the structure of human immunodeficiency virus (HIV). HIV is part of a family or group of viruses called lentiviruses. Lentiviruses other than HIV have been found in a wide range of nonhuman primates. These other lentiviruses are known collectively as simian (monkey) viruses (SIV) where a subscript is used to denote their species of origin.

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