A labour union is commonly known as a trade union. It is an organization of workers formed for the purpose of advancing its members' interests in their workplace. Trade unions play an important role in protecting the rights and welfare of employees, negotiating wages and benefits, promoting safe working conditions, and defending against unfair workplace practices. Some synonyms for labour unions include workers' unions, employee unions, labor organizations, and trade guilds. These organizations provide a platform for collective bargaining and a voice for the working class. Their aim is to facilitate fairness and equality in the workplace, ensuring that every worker gets a fair share in the business they help to build.