Tracheostomy is an opening created in the anterior wall of the trachea to allow direct access to the airway. It has several purposes including bypassing upper airway obstructions, removing secretions, and providing assisted ventilation. The document discusses the history, types, indications, technique, and complications of tracheostomy. The key points are that tracheostomy can be emergency, elective, or permanent; common indications are respiratory obstruction, retained secretions, and respiratory insufficiency; and potential complications include bleeding, infection, and tracheal stenosis.