Packs of playing cards, also known as DECKS, are collections of cards that come in a variety of sizes and styles. They typically contain 52 cards, but can also include additional cards such as jokers or wild cards. Packs of playing cards are used for a variety of card games, from classic games like poker and bridge to more modern games like Uno and Magic: The Gathering. They are also popular for solitaire and other solo card games.