The Mad Hatter is a fictional character from Lewis Carroll's novel, *Alice's Adventures in Wonderland*. He is known for his eccentric personality, whimsical clothing, and nonsensical conversations. The character is often depicted wearing a large hat, which is a symbol of his madness and creativity. In the story, the Mad Hatter hosts a tea party with the March Hare and the Dormouse. Their conversations are filled with riddles and absurdities, reflecting the nonsensical nature of Wonderland. The character has become an iconic figure in popular culture, often representing the theme of madness and the absurdity of life.