A multiple listing service (MLS, also multiple listing system or multiple listings service) is a suite of services that enables real estate brokers to establish contractual offers of compensation (among brokers), facilitates cooperation with other broker participants, accumulates and disseminates information to enable appraisals, and is a facility for the orderly correlation and dissemination of listing information to better serve broker’s clients, customers and the public. Most MLSs are controlled through a Realtor board.  A multiple listing service’s database and software is used by real estate brokers in real estate (or aircraft broker in other industries for example), representing sellers under a listing contract to widely share information about properties with other brokers who may represent potential buyers or wish to cooperate with a seller’s broker in finding a buyer for the property or asset. The listing data stored in a multiple listing service’s database is the proprietary information of the broker who has obtained a listing agreement with a property’s seller for a commission. In modern times, MLS’s have expanded their value proposition in offering tools and services, as well as real estate lead generation to their Realtors which are paying members.  Some MLS, such as HAR out of Houston, have chosen to use real estate seo as another part of their value proposition.