Galactic Basic

The Star Wars science fiction universe, created by George Lucas, features dialogue that is not spoken in natural languages. The lingua franca of the franchise, for which the language the works are dubbed or written stand in, is Galactic Basic. Characters often speak languages other than Basic, notably Shyriiwook spoken by Chewbacca, droidspeak spoken by R2-D2 and BB-8, and Huttese spoken by Jabba the Hutt.

The fictional languages were approached as sound design and developed largely by Ben Burtt, sound designer for both the original and prequel trilogy of films. He created alien dialogue out of the sounds of primarily non-English languages, such as Quechua, Haya, and Tibetan. This methodology was also used in The Force Awakens by Sara Forsberg. Lucas also insisted that written text throughout the films look as dissimilar from the English alphabet as possible, and constructed alphabets were developed.

The languages constructed for the films were criticized as not being true constructed languages, instead relying on creating the simple impression of a fully developed language. The usage of heavily accented English for alien characters was also criticized as contributing to the suggestion of racial stereotypes.

Language development was approached as sound design and was handled by Ben Burtt, sound designer for both the original and prequel trilogies. He created the alien dialogue out of existing non-English language phrases and their sounds, such as Quechua for Greedo in the original Star Wars film and Haya for the character Nien Nunb in Return of the Jedi. He also used English, as in the original Star Wars where he synthesized originally English dialogue from a Western film until it sounded alien. Burtt said of the process: "It usually meant doing some research and finding an existing language or several languages which were exotic and interesting, something that our audience — 99 percent of them — would never understand."

...
Wikipedia