National Association of Realtors (NAR): A professional organization of real estate agents and brokers that advocates for the rights of its members and promotes the values of homeownership. Established in 1908, the NAR provides a wealth of resources to help real estate professionals stay informed on market trends and best practices in real estate investment. With over 1.3 million members, the NAR is one of the largest organizations devoted to the advancement of real estate professionals across the United States.