R2-D2, pronounced Artoo-Detoo and often referred to as Artoo, was an R2 series astromech droid manufactured by Industrial Automaton with masculine programming. A smart, spunky droid serving a multitude of masters over its lifetime, R2 never had a major memory wipe or received new programming resulting in an adventurous and independent attitude. Oftentimes finding himself in pivotal moments in galactic history, his bravery and ingenuity often saved the galaxy time and time again.
Beginning his service in the employ of Queen Amidala of Naboo, the droid would wind up serving prodigal Jedi KnightAnakin Skywalker during the waning years of the Galactic Republic, often accompanied by the protocol droid C-3PO in many adventures throughout the Clone Wars. After his master's turn to the dark side of the Force, he would eventually serve Senator Bail Organa for a time in the Imperial Senate. Nineteen years following the death of the Galactic Republic, he would play a pivotal role in helping the Alliance to Restore the Republic destroy the Empire's dreaded Death Star, carrying technical readouts essential to its destruction. Serving Jedi Purge survivor Luke Skywalker throughout the Galactic Civil War, he would participate in both the Battles of Hoth and Endor, and would witness the destruction of the Empire's dreaded Death Star II a mere four years after the first space station's destruction.
In the subsequent thirty years, Artoo would accompany Luke Skywalker until the destruction of his attempted resurrection of the Jedi Order. Following Luke's disappearance, Artoo set himself into a self-imposed low power mode as newer droid models started to out-compute the aging astromech. Despite this, his celebrated role in the Rebellion protected him from the usual recycling procedure of many old droids, allowing him a peaceful semi-retirement in the Resistance as he pored over several decades of uninterrupted data, causing him to 'dream' of many of his greatest adventures.
C-3PO, sometimes spelled See-Threepio and often referred to simply as Threepio, was a 3PO unit protocol droid designed to interact with organics, programmed primarily for etiquette and protocol. He was fluent in over seven million forms of communication, and developed a fussy and worry-prone personality throughout his many decades of operation. 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.
C-3PO was built from spare parts by Anakin Skywalker, a human slave who lived in Mos Espa, a city on the Outer Rimworld of Tatooine. C-3PO's memory was erased, though R2-D2's memory was not. C-3PO and R2-D2 were assigned to the Alderaan cruiser Tantive IV, where they served senator Bail Organa for nineteen years. At some point during this time, 3PO's right leg was fitted with a mismatched droid plating.
They then became embroiled in the Galactic Civil War, when Leia Organa of the Rebel Alliance entrusted them to bring a copy of the Death Star plans to the Jedi Master Obi-Wan Kenobion Tatooine. After meeting Skywalker's son Luke and the smuggler Han Solo, the droids helped rescue princess Leia from the Empire's Death Star. They became directly attached to the three humans, helping them and their rebellion defeat the Empire and restore freedom to the galaxy, most notably when he convinced the Ewoks to aid the Rebels at the Battle of Endor.
Following the Battle of Endor, C-3PO continued serving the Skywalkers and Han Solo during the time of the New Republic. About thirty years after the events on Endor, C-3PO was still serving as an aide to Leia Organa, who had become a Generalin the Resistance, a private military group opposed to the First Order, a military junta that emulated the Old Empire. By that time, C-3PO sported a red left arm and had his translating database updated so that he could communicate in seven million different forms of communications.
Source: Wookieepedia
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