An anesthesiologist or anaesthetist is a physician trained in anesthesia and perioperative medicine. The term anaesthetist refers exclusively fully registered medical practitioners. The Colleges for Anesthesiology produces Anesthesiologists (the physicians who provide medical care to patients in many critical & non-critical situations). The Colleges for Anesthesiology even teaches students on the ways of delivering anesthesia during surgical procedures, caring for critically ill patients in an Intensive Care Unit (ICU).