This document discusses community systems strengthening (CSS), which promotes the development and sustainability of communities and community organizations to contribute to long-term health outcomes. CSS aims to improve access to and utilization of health services through increased community engagement in areas like advocacy, health promotion, and home-based care. For communities to effectively impact health, they must have strong, sustainable systems for activities, services, and funding. The core components of CSS systems include enabling environments, community networks, resources and capacity building, community activities, organizational strengthening, and monitoring and evaluation.