The British Broadcasting Corporation (BBC) is a public service broadcaster, headquartered at Broadcasting House in Westminster, London. It is the world's oldest national broadcaster,[3] and the largest broadcaster in the world by number of employees,[4] employing over 22,000 staff in total, of whom more than 16,000 are in public sector broadcasting.[5][6][7][8] The total number of BBC staff amounts to 35,402 including part-time, flexible, and fixed-contract staff.[9]