Tarot is a divination tool that over the centuries has become standard practice in spiritual communities.
Originally, Tarot was a card game, much like the modern playing cards that we have today. Each card in the deck symbolized something and based on that symbol, the game would unfold in a specific way. 
But the symbols on the tarot cards represented entire concepts such a spiritual principals, philosophical ideas and societal archetypes.
As such, the cards were not only used for card games, but also for divination.
This is the primary use of the tarot cards today. In principal, whatever tarot card is drawn or dealt is subject to divine orchestration and is therefore revelatory or provides insight to the person the divination is in service of.
“A traditional tarot deck is divided into two sections, the major and minor arcana. Used together, the major and the minor arcana reveal the full story of the interaction between supernatural and worldly influences. They reveal the relationship between the earthly realm and the divine realm relative to the subject matter at hand.”