A person engaged for the purpose of bringing his principal and a third party into a contractual relation is

A person engaged for the purpose of bringing his principal and a third party into a contractual relation is an "agent." An agent is a person who is authorized to act on behalf of another person or entity, known as the principal. The agent's role is to negotiate and enter into contracts with third parties on behalf of the principal, while representing the interests of the principal. In other words, an agent acts as a middleman between the principal and a third party. The agent has a fiduciary duty to act in the best interests of the principal, which means that they must act honestly and with reasonable care and skill. Examples of agents include real estate agents, who act on behalf of property owners to sell or lease their property to interested buyers or tenants. Another example is a travel agent, who acts on behalf of travelers to book flights, hotels, and other travel services. In contrast, an arbiter is a person who is appointed to settle disputes between parties, such as a mediator or an arbitrator. An auctioneer is a person who conducts auctions and facilitates the sale of goods or services to the highest bidder. A middleman is a general term that refers to a person or business that acts as an intermediary between two parties in a transaction.