Cabinet department

A cabinet department or '''prime minister's department''' is a department or other government agency that directly supports the work of the government's central executive office, usually the cabinet and/or prime minister, rather than specific ministerial portfolios. Such a department is present in many parliamentary democracies. The department is roughly equivalent in function to a president's office in a presidential system of government or an office of the council of ministers in a semi-presidential system. Provided by Wikipedia