What is the difference between a G tube and a PEG tube?

What is the difference between a G tube and a PEG tube?
The G-tube is one of two types of tubes- a nasogastric tube or an orogastric tube. "NG-tube" or "OG tube" respectively. These tubes are inserted either through the nose or mouth and travel down the esophagus into the stomach. The PEG tube is inserted through the abdominal wall surgically to enter the stomach. They end up in the same location, but the G-tubes are usually temporary and the PEG tubes are for long-term usage. They are for introducing things into the stomach when a person cannot take them by mouth- ie. patients who are unconscious, demented, have facial abnormalities that preclude eating, anorexics, etc.
A G tube goes into the lower portion of the stomach and into the gastric region. A PEG tube goes into the stomach.