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Nyota Uhura was a 23rd century Human female. By the 2260s, Uhura was serving in Starfleet as an operations division lieutenant, assigned to the USS Enterprise (NCC-1701) as communications officer. (Star Trek: The Original Series)

DC Comics continuity
Uhura was assigned to the USS Enterprise (NCC-1701) as communications officer in 2264, shortly after Captain James T. Kirk had taken command. 

During her first few months aboard the Enterprise, Uhura presented a professional, no nonsense image which alienated many of her crew mates who saw her as rather cold-hearted and aloof. However, she only presented this image because she wanted to prove herself now that she had been assigned to the Enterprise. She finally seized her chance during the ship's mission to the planet Tally.