A broker is a middleman who brings others together to bargain, or bargains for them.

A broker is someone who helps arranges transactions between two parties.

The broker is sometimes a mediator between a buyer and a seller. The broker sometimes gets a commission when the deal is completed.

A broker who also acts as a seller or as a buyer becomes a principal party to the deal.

A broker is different than an agent: one who acts on behalf of a principal.