Shuffling, or mixing, refers to the process of rearranging a set of items to ensure randomness. This technique is commonly used with playing cards, where the order of the cards is changed to prevent predictability. Shuffling can be done in various ways, such as the riffle shuffle or overhand shuffle, each providing a different level of randomness. In addition to cards, shuffling is also applied in other contexts, such as music playlists or data sets. For example, music streaming services often use shuffling to play songs in a random order, enhancing the listening experience by avoiding repetition.