A CNA, or Certified Nursing Assistant, is a healthcare professional who provides basic patient care under the supervision of registered nurses (RNs) or licensed practical nurses (LPNs). CNAs play a vital role in healthcare settings, such as hospitals, nursing homes, long-term care facilities, and home healthcare agencies. They assist patients with activities of daily living, such as bathing, dressing, feeding, and mobility, while also ensuring their comfort and well-being.