Protocol droid

A protocol droid was a droid who's job was to aid sentients with their etiquette and relations with each other in the galaxy. Often used in translation between different sentient species, protocol droids were exceptionally common. Known protocol droids included TC-14 and C-3PO.

Appearances

 * Star Wars Episode I: The Phantom Menace
 * Star Wars Episode II: Attack of the Clones
 * Star Wars Episode III: Revenge of the Sith
 * Star Wars Episode IV: A New Hope
 * Star Wars Episode V: The Empire Strikes Back
 * Star Wars Episode VI: Return of the Jedi