Hylians are a species in The Legend of Zelda series of video games, appearing in every game to date. The species consists of the primary characters which includes Link and Princess Zelda. They first appeared in The Legend of Zelda for the NES.
The Hylians are the race chosen by the goddesses of the game to fulfil their wills. They're the rulers over all other races in the game, and thus have trusted alliances with other species, though at the same many are directly against them, probably lusting the power that the goddesses bestowed upon them, angry that they're reduced to nothing more that mere servants. One of the primary races that hate the species are the Gerudo, whose ruler, Ganondorf, have launched attacks on the species on multiple occasions, though this is basically because of the fact that the Hylians wield the triforce shards, and that he desires the power that they'd give him.
Hylians basically live in Hyrule, where they rule over the entire country within Hyrule Town.