A multiple listing service is a private database, usually operated regionally, in which member real estate brokers share information about properties for sale. It lets listing brokers offer cooperation to other brokers who bring buyers.
The MLS is the backbone of how agents market and find homes. It centralizes detailed listing data, including price, features, photos, and status, and feeds many of the public real estate websites consumers browse. Access is generally limited to licensed members who agree to its rules.
By pooling listings, the MLS increases exposure for sellers and gives buyers a comprehensive view of available inventory. There are hundreds of separate MLS systems across the country, each with its own rules and coverage area.