An Endotracheal Tube is a specialized medical tube used to establish and maintain a secure airway during anaesthesia, surgery, emergency care, and mechanical ventilation. It is inserted through the mouth or nose into the trachea, allowing controlled delivery of oxygen and anaesthetic gases while supporting effective ventilation and airway management. Designed for reliable airway access, endotracheal tubes are available in different sizes and configurations to meet adult, pediatric, and neonatal requirements. Depending on the design, they may feature a cuff for creating an effective airway seal, a radiopaque line for positioning visibility, depth markings, and a standardized connector for connection to breathing circuits or ventilation equipment.