Detail from The Sun,
Humans have long sought to explain what is mysterious, obscured, or ambiguous in the natural world through a myriad of divination methods. Laying out cards in a particular spread, and interpreting them, allows us to discern narratives from symbols and patterns. These narratives are not an attempt at fortune-telling, but reference the past and the present, as well as advising of the possible outcomes from a particular course of action.
The story a card reading tells can encourage introspection, help us make connections between dreams and memories, and allow us to rehearse potential outcomes in our imagination to see how well they fit. Each card has multiple meanings, some known to the reader and some known only to the person inquiring, and even then, not always consciously.