The document defines anesthesia as an "induced, controlled, reversible, painfree state of sleep, which makes an individual, non responsive to noxious stimulus." It explains that patients are induced with intravenous, inhalational, or local anesthetics. The induced state is controlled through drug dosages and is mostly reversible. The goal is for patients to be painfree irrespective of the type of anesthesia. The induced state is described as a sleep-like state where patients are arousable rather than unconscious and non-responsive to painful surgical stimuli.