The Silmarillion is a collection of mythopoeic stories by J.R.R. Tolkien that serves as a foundational work for his Middle-earth legendarium. It details the creation of the world, the rise and fall of great civilizations, and the epic tales of the Elves, Men, and other beings in Tolkien's universe. Comprising several interconnected narratives, the Silmarillion explores themes of heroism, betrayal, and the struggle between good and evil. Central to the work are the Silmarils, three precious jewels that embody the light of the Two Trees of Valinor, which play a crucial role in the fate of the world.