Entrustment often puts the trusting party in a position of vulnerability, such as when an individual relies on the advice and counsel of a real estate agent in a property transaction. In the United States, legal rules have developed to mitigate the concern that those on the dominant side of a relationship will exploit the subservient party for personal gain. Broadly, these rules refer to the entity on the dominant side of the relationship as the fiduciary, the subservient party as the beneficiary, and the collection of obligations as fiduciary duties. This note briefly introduces the most salient principles of fiduciary duties in the corporate context.