Smaug is a dragon, and the main antagonist of Tolkien's "The Hobbit". Always use in conjunction with the [tolkiens-legendarium] tag and possible [the-hobbit].
Smaug, also known as Smaug the Golden and Smaug the Magnificent, is a dragon featured in Tolkien's The Hobbit.
Smaug resides in Erebor, the Lonely Mountain, where he sleeps atop his hoard. The dwarven party's quest, as told in The Hobbit, is to kill Smaug and reclaim the mountain and the treasure, which they consider to be rightfully theirs. They enlist the help of Bilbo Baggins, who was advertised to them as a skillful burglar.
Smaug is killed with an arrow by Bard the Bowman of Esgaroth, who was told about a weak spot by a thrush who overheard Bilbo discussing this weak spot with the dwarves.