A broker is a person or firm that acts as a required intermediary between an investor and a securities exchange, essentially playing the role of a middle man. In this video, you'll learn a simple way to understand this concept through an easy and brief explanation. Acting as an agent for a customer and business, these folks charge a commission. They provide investors with research, market intelligence, and access to private client offerings. Real estate brokers are state licensed and representing the seller of a property.