A Practice Note providing a broad overview of agency law in the context of commercial transactions. This Note focuses on agents acting as intermediaries between a principal and third parties for the sale of the principal's goods or services. It discusses how to distinguish an agent, often referred to in the US as a sales agent, sales representative, or sales rep from a distributor and the consequences of that determination. This Note also discusses the issues of an agent's express, implied, and apparent authority and situations where the agent does not disclose the principal's existence or identity.