ENT, short for Ear, Nose, and Throat, refers to a branch of medicine (Otolaryngology) and the specialist doctor (Otolaryngologist or ENT doctor) who diagnoses and treats disorders of these areas, plus related head and neck structures, handling issues like infections, hearing loss, sinusitis, sleep apnea, and balance problems. Its a surgical specialty focusing on function and long-term health in these vital sensory and respiratory passages.