Whats the difference between a tracheostomy and endotracheal intubation?

An incision. Endotracheal intubation is usually done through the mouth and sometimes through the nose. Tracheostomy involves an incision through the neck into the trachea.
Mouth vs surgical. Endotracheal intubation is the breathing tube in the mouth or nose, usually for general anesthesia and short term intensive care unit care. Tracheostomy is a surgically placed hole in the front of the neck where the tube is passed. This is for long term need for a breathing tube, with or without a ventilator (breathing machine).