From Academic Kids
Public administration is, broadly speaking, the implementation of policy within a state framework. A good working definition is, "taking care of the state's, and international organizations', business by civil servants within the executive branch of government, other than public policy."
The more specific term public management refers to ordinary, routine or typical management concerns, but in the context of achieving public good with public infrastructure. There is necessarily some overlap between the terms.
- American Society for Public Administration (http://www.aspanet.org/)