A real estate agent, referred to often as a Realtor and/or a real estate broker is a person who represents sellers or buyers of real estate or real property. While a broker may work independently, an agent usually works under a licensed broker to represent clients. Brokers and agents are licensed by the state to negotiate sales agreements and manage the documentation required for closing real estate transactions. Buyers and sellers are generally advised to consult a licensed real estate professional for a written definition of an individual state's laws of agency. Many states require written disclosures to be signed by all parties outlining the duties and obligations.