El-Aurians are a humanoid nomadic non-player race found throughout the Federation. They are remarkable for their extraordinarily long lifespan and consider themselves good listeners. A famous El-Aurian is Guinan who worked as a bartender on the Enterprise-D. (Star Trek: The Next Generation)
The El-Aurians are an enigmatic race and little is known about them. At some point before 2365 their homeworld was assimilated by the Borg. The time period their homeworld was assimilated suggests that their homeworld is quite distant from the Federation, possibly in the Delta Quadrant. (TNG episode Q Who)
El-Aurians are physically very similar to Humans. Members of the race are very long lived with lifespans of several centuries. Guinan once said that her father was 700 years old. El-Aurians may have Empathic and possibly transtemporal senses.