A fiduciary duty is the highest standard of care at either equity or law. A fiduciary is expected to be extremely loyal to the person to whom they owe the duty (the "principal"): they must not put their personal interests before the duty, and must not profit from their position as a fiduciary, unless the principal consents. The fiduciary relationship is highlighted by good faith, loyalty and trust, and the word itself originally comes from the Latin fides, meaning faith, and fiducia.