Endotracheal intubation is a medical procedure used to secure an airway in patients who are unable to breathe adequately on their own. It involves inserting a flexible tube into the trachea, which is the windpipe that connects the throat to the lungs. This tube allows for mechanical ventilation and ensures that oxygen can reach the lungs effectively. The procedure is typically performed in emergency situations, during surgery, or in critical care settings. A healthcare professional, often an anesthesiologist or emergency physician, uses a laryngoscope to visualize the vocal cords and guide the tube into place, ensuring proper positioning for effective breathing support.