Labor unions are organizations that represent the collective interests of workers in various industries. They advocate for better wages, working conditions, and benefits through collective bargaining with employers. By uniting workers, labor unions aim to amplify their voices and negotiate more effectively than individuals could on their own. These unions play a crucial role in protecting workers' rights and ensuring fair treatment in the workplace. They also engage in political activities to influence labor laws and policies that affect their members. Overall, labor unions are essential for promoting social and economic justice for workers.