Aces are playing cards that hold a value of one or can be the highest card in many card games, depending on the rules. In a standard deck of cards, there are four aces, one for each suit: hearts, diamonds, clubs, and spades. Aces are often considered powerful cards in games like poker and blackjack, where they can significantly influence the outcome. In addition to card games, the term "ace" is also used in various contexts. For example, in aviation, an "ace" refers to a pilot who has shot down five or more enemy aircraft in combat. The term has also been adopted in sports and academics to describe someone who excels or performs exceptionally well in their field.