The MLS (Multiple Listing Service) is a computerized database that enables realtors to display real time real property listing information, so that authorized participants, as well as the public, can view and evaluate listings. The MLS serves as a means by which authorized participants (listing brokers representing sellers) make blanket unilateral offers of cooperation and compensation to other authorized participants (co-operating brokers representing buyers). MLS participants actively show and sell homes that are listed by other participants (member realtors). This process provides the basis upon which the Broker, who is working with the buyer and referred to as the Cooperating Broker, earns a commission. A cooperating broker's entitlement to compensation is determined by the broker's performance as procuring cause of sale or lease. 75% of all properties sold are sold through the MLS.

See also: Flat fee MLS