Smaug is a fictional dragon from J.R.R. Tolkien's novel, The Hobbit. He is known for his immense size, cunning intelligence, and greed for treasure. Smaug resides in the Lonely Mountain, where he hoards a vast amount of gold and precious gems, having taken it from the Dwarves of the Erebor. In the story, Smaug is awakened from his slumber by the Hobbit Bilbo Baggins, who is sent on a quest by the Wizard Gandalf and the Dwarf Thorin Oakenshield. The dragon's fiery breath and fierce nature make him a formidable antagonist, representing the dangers of greed and power.