This document summarizes the geography and history of the HIV/AIDS epidemic. It begins by explaining what HIV/AIDS is. It then discusses how the epidemic originated in Africa in the 1930s likely from monkeys/apes and spread. Today, sub-Saharan Africa accounts for most HIV/AIDS cases and deaths. The epidemic has now spread globally with an estimated 34 million people living with HIV/AIDS in 2011. In the US, the first AIDS cases were reported in 1981 and has since caused over 500,000 deaths. Certain urban areas and populations like gay/bisexual men have been most severely affected. In conclusion, HIV/AIDS disproportionately impacts low/middle-income countries and regions where it originated like sub