Refers to a person or business that acts on behalf of another, such as a sales agent, travel agent, or commercial representative.
He works as an insurance agent.
I ordered the product through that agent.
代理人 is a more general term for a representative or proxy, often used in legal contexts, while 代理業者 specifically refers to a business or commercial agent.
代理店 emphasizes the physical shop or office of an agent, whereas 代理業者 focuses on the agent as a business entity or individual.
Compound of 代理 (dairi, 'representation') + 業者 (gyōsha, 'trader, business operator').