Tarot (/ˈtæroʊ/, first known as trionfi and later as tarocchi or tarocks) is a set of playing cards used in tarot games and in fortune-telling or divination. From at least the mid-15th century, the tarot was used to play trick-taking card games such as Tarocchini. From their Italian roots, tarot games spread to most of Europe, evolving into new forms including German Grosstarok and modern examples such as French Tarot and Austrian Königrufen.

Tarot is commonly found in many countries, except in English and Spanish speaking countries where tarot games are not as widely played, It is normally found in the form of specially designed cartomantic decks used primarily for tarot card reading, in which each card corresponds to an assigned archetype or interpretation for divination, fortune-telling or for other non-gaming uses.

The emergence of custom decks for use in divination via tarot card reading and cartomancy began after French occultists made elaborate, but unsubstantiated, claims about their history and meaning in the late 18th century. Thus, there are two distinct types of tarot packs in circulation: those used for card games and those used for divination. However, some older patterns, such as the Tarot de Marseille and the Swiss 1JJ Tarot, originally intended for playing card games, are also used for cartomancy.

Tarot has four suits that vary by region: French suits are used in western, central and eastern Europe, and Latin suits in southern Europe. Each suit has 14 cards: ten pip cards numbering from one (or Ace) to ten; and four face cards: King, Queen, Knight, and Jack/Knave/Page. In addition, the tarot also has a separate 21-card trump suit and a single card known as the Fool. Depending on the game, the Fool may act as the top trump or may be played to avoid following suit. These tarot cards are still used throughout much of Europe to play trick-taking card games.

The use of tarot for trick-taking games was at one time widespread across the whole of Europe except the British Isles, the Iberian Peninsula, and the Balkans. Having fallen into decline by the 20th century, the games later experienced a renaissance in some countries and regions. For example, French Tarot was largely confined to Provence in the 18th century, but took off in the 1950s to such an extent that, in 1973, the French Tarot Association (Fédération Française de Tarot) was formed and French Tarot itself is now the second most popular card game in France. Tarock games like Königrufen have experienced significant growth in Austria where international tournaments are held with other nations, especially those from eastern Europe that still play such games, including Hungary, Romania, Slovakia and Slovenia.

Denmark appears to be the only Scandinavian country that still plays tarot games, Danish Tarok being a derivative of historical German Grosstarock. The game of Cego has grown in popularity again in the south German region of Baden. Italy continues to play regionally popular games with their distinctive Tarot packs. These include: Ottocento in Bologna and Sicilian Tarocchi in parts of Sicily. Meanwhile Troccas and Troggu are still played locally in parts of Switzerland.

Tarot cards, then known as tarocchi, first appeared in Ferrara and Milan in northern Italy, with the Fool and 21 trumps (then called trionfi) being added to the standard Italian pack of four suits: batons, coins, cups and swords. Scholarship has established that early European playing cards were probably based on the Egyptian Mamluk deck invented in or before the 14th century, which followed the introduction of paper from Asia into Western Europe. By the late 1300s, Europeans were producing their own cards, the earliest patterns being based on the Mamluk deck but with variations to the suit symbols and court cards.

The first records of playing cards in Europe date to 1367 in Bern and they appear to have spread very rapidly across the whole of Europe, as may be seen from the records, mainly of card games being banned. Little is known about the appearance and number of these cards, the only significant information being provided by a text by John of Rheinfelden in 1377 from Freiburg im Breisgau, who, in addition to other versions, describes the basic pack as containing the still-current 4 suits of 13 cards, the courts usually being the King, Ober and Unter ("marshals"), although Dames and Queens were already known by then.