The Key to the Tarot" is a comprehensive exploration of the Tarot, authored by A.E. Waite, who is renowned for his significant contributions to the understanding of Tarot symbolism and interpretation. The book serves as both an introduction and a guide, emphasizing the Tarot's mystical and philosophical dimensions. Waite delves into the historical origins of the Tarot, its structure, and the meanings of its 78 cards, including the Major and Minor Arcana.