Civil society organizations are a vibrant and essential feature in the democratic life of countries across the globe. CSOs collaborate with the full diversity of people and promote their rights. The essential characteristics of CSOs as distinct development actors – that they are voluntary, diverse, non-partisan, autonomous, non-violent, working and collaborating for change – are the foundation for the Istanbul principles for CSO development effectiveness. These principles guide the work and practices of civil society organizations in both peaceful and conflict situations, in different areas of work from grassroots to policy advocacy, and in a continuum from humanitarian emergencies to long-term development.