An attending physician is a special doctor who takes care of patients in the hospital. They are the head of the medical team and make important decisions about the patient's treatment.
Think of them like the captain of a ship - they are in charge and make sure everyone is working together to help the patient get better. They are also responsible for teaching other doctors and trainees about medicine and patient care.
But don't worry, even though they are in charge, they work closely with other doctors and nurses to make sure everyone is giving the patient the best care possible.