Used in the field of anesthesia and critical care to maintain a patent airway and facilitate mechanical ventilation in patients who are unable to breathe adequately on their own. These flexible tubes made of materials such as polyvinyl chloride (PVC) or silicone. They come in various sizes to accommodate patients of different ages and sizes. The tube has an inflatable cuff near the distal end, which, when inflated, helps secure the tube in the trachea and prevents air leakage. Mainly used for management and protection of the airway, administration of anaesthetic gases etc.