An MLS or also called as Multiple Listing Service is a powerful online tool started and operated by REALTORS® to make transaction efficient and seamless for real estate brokers, realtors, and also home buyers. There are over 800 MLSs across the country and each is geographically based—and all separate from each other. You can only access your local MLS if you are a state licensed real estate broker or an affiliate professional. Most of these MLSs will also list your property to different real estate portals/brokerages such as Zillow, Redfin, Trulia, and Realtor.com. For Sale By Owner, or home sellers who want to sell their property without hiring a realtor, pick a Flat Fee MLS option to market their homes faster and cheaper since they can still list their property on MLS without paying the full commission. So, instead of a 5 to 6% commission rate, they only pay a fixed fee to list their homes for sale on the MLS.