An agent is a person authorized to act on behalf of another person called the principal. The relationship between them is called agency. An agency can be created expressly through an agreement or impliedly through actions like ratification or holding out. As an agent, one has duties to follow the principal's instructions, conduct business with care, communicate properly, and not make secret profits. The principal has duties to pay the agent and not interfere without cause. An agency terminates through completion, death, lapse of time, or revocation except if the agency is coupled with an interest of the agent.