The British Broadcasting Corporation (BBC) is a British public service broadcaster. Its headquarters are at Broadcasting House in Westminster, London. It is the world's oldest national broadcaster, and the largest broadcaster in the world by number of employees. It employs over 22,000 staff in total, more than 16,000 of whom are in public sector broadcasting. The total number of staff is 35,402 when part-time, flexible, and fixed-contract staff are included.