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C-3PO (/siË Ë Î¸riË pi.oÊ /, phonetically spelled See-Threepio; 3PO or Threepio for short) is a robot character from the Star Wars universe who appears in both the original Star Wars films and the prequel trilogy. He was also a major character in the ABC television show Droids, and appears frequently in the series' "Expanded Universe" of novels, comic books, and video games. Along with Anakin Skywalker/Darth Vader, Obi-Wan Kenobi and R2-D2, he is one of only four characters to appear in all six Star Wars films. C-3PO was played by Anthony Daniels in all six films; he and R2-D2 (played by Kenny Baker) are the only characters portrayed by the same actor in all six films.

C-3PO is a protocol droid designed to serve human beings, and boasts that he is fluent in "over six million forms of communication". He is generally seen with his long-time counterpart, R2-D2. Threepio's main function is to assist etiquette, customs, and translation, so that meetings of different cultures run smoothly. Threepio and R2-D2 played vital and pivotal roles in the Galaxy's history[citation needed]. While many protocol/interpreter droids range in color, C-3PO's own identifying colors are primarily gold with silver from the right knee down.

(Description from Wikipedia)

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