A more thorough explanation:

Definition: A person who stands for or acts on behalf of another, usually with designated authority granted by law or by the rules of a group or organization. This can include:

• An executor, administrator, or other legal representative
• A legal heir
• A registered representative approved to sell securities to the public
• A member of a legislature, especially of the lower house

Examples:

• As an officer of the union, she was the accredited representative of the employees in the wage dispute.
• A class representative sues on behalf of a group of plaintiffs in a class action.
• The owner was the football team's representative at the labor negotiations.

These examples illustrate how a lawful representative can act on behalf of others in various contexts, such as in labor negotiations, legal disputes, and securities sales.