A charity NGO is independent of the government. Local, national, and international NGOs can take numerous shapes. Some NGOs impact government policy or public opinion. Service groups help needy people and communities. NGOs are run by volunteers or personnel passionate about a topic. Donations from individuals, foundations, and companies fund their operations. They provide vital services to marginalized or underserved people in locations where governments cannot or will not address social, political, or environmental challenges. Some focus on specific diseases or health issues, while others focus on access to healthcare or socioeconomic determinants of health including poverty and inequality.