Characteristics:
1. consensual
2. nominate
3. preparatory
4. principal
5. unilateral; reciprocal (if for compensation)
Nature: Since it is a contract, there must be a meeting of the minds as to consent, object, and cause.
Basis: Representation. The acts of the agent on behalf of the principal within the scope of his authority produce the same legal and binding effects as if they were personally done by the principal. Hence, the distinguishing features of agency are its representative character & its derivative authority.
Purpose: extend the personality of the principal through the facility of the agent