what's a trade union?

A trade union, also known as a labor union, is an organization of workers who have come together to achieve common goals such as protecting the integrity of its trade, improving safety standards, and attaining better wages, benefits, and working conditions through the increased bargaining power wielded by the creation of a monopoly of the workers. The trade union, through its leadership, bargains with the employer on behalf of union members and negotiates labor contracts with employers. This may include the negotiation of wages, work rules, complaint procedures, rules governing hiring, firing and promotion of workers, benefits, workplace safety and policies. The agreements negotiated by the union leaders are binding on the rank and file members and the employer and in some cases on other non-member workers.