UNICEF is an international non-governmental organization established by the United Nations to provide humanitarian and developmental aid to children worldwide. It aims to advocate for children's rights and help meet their basic needs. UNICEF relies on funding from governments and private donors to carry out its work in areas like child survival, development, protection, education, HIV/AIDS, and policy advocacy. It operates in over 190 countries and territories to promote issues like equal rights, healthcare, nutrition, water and sanitation, and education.