ACAS, or the Advisory, Conciliation and Arbitration Service, is a public body in the United Kingdom that provides support for employers and employees in workplace disputes. Its main goal is to promote good employment relations and help resolve conflicts through advice, mediation, and arbitration services. Established in 1975, ACAS offers resources and guidance on various employment issues, including unfair dismissal, discrimination, and workplace rights. It also provides training and information to help organizations improve their workplace practices and foster a positive working environment.