Violence against women and girls (VAWG) is preventable. Over the last two decades, VAWG prevention practitioners and researchers have been developing and testing interventions to stop violence from occurring, in addition to mitigating its consequences. This document is an executive summary of the longer review of the state of the field of VAWG prevention, five years on after the UKAID-funded, What Works to Prevent Violence Against Women and Girls (What Works) programme, a six year investment, in advancing our understanding of What Works within the context of the wider evidence base.