Oracle cards are a type of fortune-telling cards. They are used to answer questions about the future. The cards are based on the work of a woman named Madam Lenormand. She was a French fortune-teller who lived in the 19th century. She created a set of 36 cards that were used for fortune-telling. These cards were later used by a man named A. E. Waite to create a new set of cards called the Rider-Waite deck. This deck is still widely used today.