Final answer:
Labor unions, also known as trade unions, represent workers with a variety of skills from multiple industries and negotiate for better wages, benefits, and working conditions.
Step-by-step explanation:
Unions representing workers with a variety of skills and from multiple industries are known as labor unions or trade unions. These unions are formed to protect the rights and interests of workers, and to negotiate with employers for better wages, benefits, and working conditions. Some examples of such unions include the American Federation of Labor-Congress of Industrial Organization (AFL-CIO), the American Federation of Teachers, and United Auto Workers.