The Na’vi are the indigenous species that lives on Pandora in James Cameron’s 2009 film Avatar.
Avatar presents Pandora as a habitable moon orbiting the fictional gas giant Polyphemus in the Alpha Centauri star system. The Na’vi are its tall, blue-skinned humanoid inhabitants, organized into clans with distinct territories, customs and relationships to the moon’s living environment.
The film’s human characters use genetically engineered avatar bodies that combine human and Na’vi biological material. These bodies allow human operators to interact with Pandora and communicate with the Na’vi, but they are not the same as naturally born Na’vi individuals.
The Na’vi language was created for the film by linguist Paul Frommer. Avatar was released in 2009 and became known for its extensive use of computer-generated environments and motion-capture performances. Pandora in this question is the fictional moon, not the mythological figure or a modern brand.