A Cabinet Secretary is usually a senior official who provides services and advice to a Cabinet of Ministers as part of the Cabinet Office.
The Cabinet Office is a department of the Government of the United Kingdom responsible for supporting the Prime Minister and Cabinet of the United Kingdom.
A cabinet is a body of high-ranking state officials, typically consisting of the top leaders of the executive branch.
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.
The title secretary of state or state secretary is commonly used for senior or mid-level posts in governments around the world.