A fortune teller's deck is a set of cards used for divination and fortune telling. The most common type of fortune teller's deck is the Tarot, which consists of 78 cards divided into two parts: the Major Arcana and the Minor Arcana. The Major Arcana consists of 22 cards that represent major life events, while the Minor Arcana consists of 56 cards that represent everyday events. Tarot cards are used to gain insight into the past, present, and future, and can be used to help make decisions or gain clarity on a situation.