The functions of the Union Public Service Commission (UPSC) are primarily advisory and related to recruitment and disciplinary matters, as outlined in Article 320 of the Constitution. Supervising the functioning of the State Public Service Commissions (State PSCs) is not a function of the UPSC. State PSCs are independent constitutional bodies established under the same part of the Constitution (Part XIV) as the UPSC, with their own defined roles and responsibilities for state services. The UPSC has no supervisory authority over them.