A trade union, also called a labor union, is an organization of workers who have come together to achieve common goals such as better wages, benefits, and working conditions through collective bargaining. Trade unions originated in the 19th century in countries like Britain and the US as workers organized against exploitation. While British unions pursued political activism and the formation of labor parties, American unions focused on collective bargaining. Today, unions represent millions of workers globally and have helped secure improved economic outcomes, though they may also potentially cause issues like unemployment or wage inflation if they become too powerful.