1) Tracheostomy is a surgical opening into the trachea through the neck that allows for an alternative airway. It has several purposes including bypassing upper airway obstruction and making it easier to clear secretions.
2) The procedure involves making incisions through the skin and trachea rings to insert a tracheostomy tube. It can be done via open or percutaneous dilational tracheostomy techniques.
3) Tracheostomy is indicated when normal breathing is compromised due to conditions like upper airway infections/injuries or an inability to cough effectively. It provides benefits like improved ventilation and protection against aspiration.