Navi is a fairy who, ordered by the Great Deku Tree, becomes Link's companion in The Legend of Zelda: Ocarina of Time. She accompanies Link on his journey to defeat Ganondorf. She gives Link advice, often calling out to Link with cries of "Hey!" or "Listen!". Her name is derived from the word "navigate", as she serves as a guide for Link and helps him find his away around Hyrule.
Following Ganon's defeat, Navi leaves Link's side for reasons that are never explained, and she is never seen again after her departure. Though it is never made explicit in the game, it is stated in various sources such as Hyrule Historia that as The Legend of Zelda: Majora's Mask begins, Link is searching for Navi when he inadvertently enters Termina.
Navi makes a cameo appearance in Hyrule Warriors, where she appears to warn Sheik and Impa that Darunia has been enchanted by someone named Zelda, and that he has imprisoned Princess Ruto.