A foretelling deck is a type of card deck used for divination and fortune-telling. The most popular type of foretelling deck is the Tarot, which consists of 78 cards divided into two parts: the Major Arcana, which contains 22 cards, and the Minor Arcana, which contains 56 cards. Tarot cards are used to gain insight into the past, present, and future, and can be used to answer questions about life, relationships, and other matters.