WHO today issued an “Early Release Guideline” on when to start antiretroviral therapy and on pre-exposure prophylaxis (PrEP) for HIV. This document recommends 1) initiation of ART in adults living with HIV, regardless of CD4 cell count, and 2) offer of PrEP as a prevention option to all people at substantial risk of acquiring HIV. If implemented, these sweeping recommendations have the potential to change the world by simplifying ART for people living with HIV and revolutionizing prevention for people at risk.