This document discusses the difference between risk and vulnerability in the context of HIV/AIDS. It defines risk as the possibility of acquiring HIV infection, which can be increased by behaviors like unprotected sex with partners of unknown status or injecting drug use with shared needles. Vulnerability is not defined but the document discusses groups that are vulnerable to HIV like sex workers and men who have sex with men. It provides examples of HIV prevalence and risk behaviors in different populations in Southern states of India. It stresses the importance of an enabling environment that protects human rights to effectively address HIV.