Advanced Practice Nurses (APNs) are registered nurses who have gained advanced education, knowledge, and clinical skills through a master's or doctoral program. They play a crucial role in the healthcare system by providing high-quality, cost-effective, and patient-centered care. APNs include Nurse Practitioners (NPs), Clinical Nurse Specialists (CNSs), Nurse Anesthetists (CRNAs), and Nurse Midwives (CNMs).