Not all agents or brokers are REALTORS® - there is a difference.
As a prerequisite for selling real estate, real estate professionals must be licensed by the province in which they work, either as an agent/salesperson or as a broker. Before a license is issued, minimum standards for education, examinations and experience, which are determined on a state-by-state basis, must be met. After receiving a real estate license, most agents join their local board or association of REALTORS® and the National Association of REALTORS® (NAR), the world's largest professional trade association. They can then call themselves REALTORS®.
The term "REALTOR®" is a registered collective membership mark that identifies a real estate professional who is a member of NAR and who adheres to its strict Code of Ethics (which in many cases goes beyond state law). In most areas, it is the REALTOR® who shares information on the homes they are marketing, through a Multiple Listing Service (MLS). Working with a REALTOR® who belongs to an MLS will give you access to the greatest number of homes.