Agency is a relationship based on an agreement authorizing one person, the agent, to act for another, the principal. For example an agent may negotiate and make contracts with third persons on behalf of the principal. Actions of an agent can obligate the principal to third persons. Actions of an agent may also give a principal rights against third persons. It is important to be able to distinguish agencies from other relationships that are similar. Control and authority are key factors in distinguishing ordinary employees and independent contractors from agents.