A chamber of commerce is a business organization that supports and promotes the interests of a specific area's business community. Chambers of Commerce are usually nonpartisan and have the primary goal to promote economic growth and business-friendly policies. In the Middle Ages, the first chambers were established to protect merchants' interests. They have continued to promote free trade and business-friendly policies since then. There are many chambers in towns and cities across the country today, along with numerous state and national chambers. With millions of members, the U.S. Chamber of Commerce ranks as the largest American business organization. The Chamber advocates for businesses at all levels, including the federal, state and local levels. It also works to promote pro-business policies. The Chamber offers support and resources to businesses. This includes networking opportunities, education programs, and discounts for products and services.