A holiday edition of C-3PO wearing a Xmas sweater featuring his best friend R2D2. (See-Threepio) was a 3PO-series protocol droid, programmed primarily for etiquette and protocol. Sometimes referred to as Threepio, he was fluent in over six million forms of communication.
Along with his counterpart, the astromech droid R2-D2, C-3PO constantly found himself directly involved in pivotal moments of galactic history, and aided in saving the galaxy on many occasions.