The Advisory, Conciliation and Arbitration Service (Acas) is a Crown non-departmental public body of the Government of the United Kingdom. Its purpose is to improve organisations and working life through the promotion and facilitation of strong industrial relations practice. It may do this through a number of media such as arbitration or mediation, although the service is perhaps best known for its collective conciliation function - that is resolving disputes between groups of employees or workers, often represented by a trade union, and their employers. Acas is an independent and impartial organisation that does not side with a particular party, but rather will help the parties to reach suitable resolutions in a dispute.