Which C.S. Lewis novel features the character Aslan and the White Witch?

The C.S. Lewis novel featuring Aslan and the White Witch is The Lion, the Witch and the Wardrobe.

The book is the best-known entry point to Narnia and follows Peter, Susan, Edmund, and Lucy Pevensie. Lucy discovers a passage through a wardrobe into Narnia, where the White Witch has caused perpetual winter and prevented Christmas from coming.

Aslan, the great lion, is the most important benevolent figure in the story. His arrival changes the balance of power and helps lead Narnia toward liberation. The novel uses fairy-tale patterns, biblical imagery, and themes of betrayal, sacrifice, and restoration.

Aslan and the White Witch appear in other Narnia-related discussions, but their defining confrontation begins in this first published Narnia novel. The film adaptation released in 2005 introduced the story to a new generation.