11 Pa. Stat. § 2603
The following words and phrases when used in this act shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"County agency." The county children and youth social service agency established pursuant to section 405 (relating to powers and duties of local authorities as to children) of the act of June 24, 1937 (P.L. 2017, No. 396), known as the County Institution District Law, or its successor, and supervised by the Department of Public Welfare under Article IX (relating to departmental powers and duties as to supervision) of the act of June 13, 1967 (P.L. 31, No. 21), known as the Public Welfare Code.
"Private agency." A children and youth social service agency subject to the requirements of 55 Pa. Code Ch. 3680 (relating to administration and operation of a children and youth social service agency).
"Resource family." A family which provides temporary foster or kinship care for children who need out-of-home placement and which may eventually provide permanency for those children, including as an adoptive family.
11 P.S. § 2603