Beyond the comprehensive assessment of the current state of the cook stoves sector, the report provides the first global baseline for clean and improved cooking, including analyses of fuel and stove penetration, end-user segmentation, and industry structure. It also proposes a common terminology to define various types and categories of cooking devices. It offers lessons and recommendations that we hope will guide governments, private sector, and the donor community in developing increasingly effective interventions to help billions of people who still rely on biomass for their cooking needs.