A collective agreement or collective bargaining agreement (CBA) is a special type of commercial agreement, usually as one negotiated "collectively" between management (on behalf of the company) and trades unions (on behalf of employees). The collective agreement regulates the terms and conditions of employees in their workplace, their duties and the duties of the employer. It is usually the result of a process of collective bargaining between an employer (or a number of employers) and a trade union representing workers.