Question

who are civil servants and how are they useful for the cabinet

Answer 1

A Cabinet Secretary is usually a senior official (typically a civil servant) who provides services and advice to a Cabinet of Ministers as part of the Cabinet Office. In many countries, the position can have considerably wider functions and powers, including general responsibility for the entire civil service.

The title of Cabinet Secretary may also be used as an alternative term for a politically appointed cabinet minister, derived from Secretary of State—the formal title for ministers. This naming convention is used in Japan, Kenya, Scotland and the United States.