It's a mixture of government and private ownership. For instance in the US, the governments (state and local) own most of the schools and airports, the federal government owns AMTRAK, the passenger railroad. read more
The theory and political-economic system of state/government ownership of capital and other means of production (land, factories, etc.) allowing the government to make all major decisions about production and distribution with the goal of making economic opportunity and wealth equal among the people. read more