A labor union is an organization that represents workers in a particular industry or trade. The main purpose of a labor union is to advocate for and protect the rights, interests, and welfare of its members through collective bargaining with employers. Labor unions negotiate on behalf of their members for better pay, benefits, working conditions, job security, and other terms and conditions of employment. They also provide support and representation to workers in disputes or grievances with management. In addition, labor unions often engage in political activism and advocacy to promote policies that benefit working people. Overall, the goal of a labor union is to improve the rights, wages, benefits, and overall well-being of its members through collective action and organization.