A physician assistant (PA) is a licensed healthcare professional who practices medicine under the supervision of a physician. PAs are trained to perform a variety of tasks, including taking medical histories, conducting physical exams, diagnosing illnesses, and developing treatment plans. They can also prescribe medications and assist in surgeries, making them an essential part of the healthcare team. To become a PA, individuals typically complete a master's degree from an accredited PA program, which includes both classroom instruction and clinical training. PAs work in various settings, such as hospitals, clinics, and private practices, and can specialize in areas like family medicine, emergency medicine, or pediatrics.