Communities have long been seen as of central importance to individuals and families, and as critical lever for change. In recent years, the emphasis on community as an organizing principle to address a range of social problems and developmental needs of children and families has been increasing. This paper explores the question of why community is important for children and families, what communities can provide for their well-being, and how they might be strengthened. It outlines some of the reasons behind the interest in community as a locus for policy and practice, explores the idea of ‘community capacity’ and how to build it, and distills the principal strategies used by contemporary efforts to build capacity in disadvantaged communities. Finally, it examines both the promise and the limitations of a community capacity framework as an orientation toward social change and as an approach for addressing the needs of disadvantaged children and families.