An MLS or also called a Multiple Listing Service is a central registry of property listings that are operated by REALTORS®. It’s a search engine tool and service that allows real estate brokers and agents to list homes for sale, store home data, and let brokers, sellers, and buyers interact in one place. State-licensed real estate professionals pay for a membership fee to access the MLS—and only affiliate professional and licensed realtors can enter the system. Once your property is listed on the local Maryland MLS, it will be distributed over to Realtor.com, Trulia, Redfin, Zillow, and other available real estate brokerages and portals. For Sale By Owner home sellers most likely choose a Flat Fee MLS service rather than hiring a full-service real estate agent to market their homes. FSBO sellers are homeowners who want to sell a property without hiring a realtor. Instead of a 5 to 6% commission fee, a Flat Fee service can list your home on the Maryland MLS for a pre-set amount of money.