The Service Employees International Union (SEIU) is a labor union in the United States that represents workers in various sectors, including healthcare, public services, and property services. Founded in 1921, the SEIU advocates for better wages, benefits, and working conditions for its members, who include nurses, janitors, and home care workers. With millions of members, the SEIU is one of the largest unions in North America. It engages in collective bargaining and political activism to influence policies that affect workers' rights and social justice. The union aims to empower its members and improve their quality of life through solidarity and organized action.