Final answer:
A broker, acting as an agent, represents a principal. This principal could be either a buyer or a seller, and the broker's role is to facilitate transactions on behalf of that principal. The exact nature of the representation depends on the industry and the context.
Step-by-step explanation:
As an agent, a broker is employed by and acts on behalf of a principal. The principal could be a buyer or a seller, depending on who the broker represents. In the context of real estate, for example, a broker may act for a seller (as a listing agent) or for a buyer (as a buyer's agent), undertaking activities to facilitate the buying or selling of property on behalf of their client.
In other industries, such as talent representation, agents like Alaine Alldaffer pitch actors to casting directors, effectively representing the interests of the actor, who is their principal. In lobbying, an in-house lobbyist is an employee lobbying on behalf of their employer (the principal).