MLS stands for multiple listing service. There are hundreds of local MLS throughout the U.S. Sites like Zillow, Realtor.com, Redfin, and Trulia pull listings from the MLS.  Only real estate agents, brokers, and companies with licenses can post on the MLS. FSBO sellers have to pay a flat fee MLS company to get their home on the MLS. Your MLS listing will feature a listing broker's contact information. The broker will forward leads and inquiries to you so you can communicate with buyers yourself.