Galactic Basic Standard (or Galactic Basic, Galactic Standard, Galaxy Standard or just Basic) is the most prevalent and most used language in the galaxy.
Old Galactic Standard started as a slang or jargon of traders and spacers, based on a mix of early Human languages, Durese, and Bothese. Because of its popularity with members of those professions, its popularity and acceptance spread. Old Galactic Standard was later further influenced by Dromnyr, resulting ultimately in the standard Basic.
Under the Galactic Empire, a version of the language was known as Imperial Basic. The language was adopted by the Rebel Alliance, and as such was spoken in the Alliance of Free Planets, the New Republic, the Imperial Remnant, the Galactic Alliance, and the Fel, Sith and True Empires.