A wallet, pouch or billfold, is a small, flat case that is used to carry such personal items as cash, credit cards, and identification documents (driver's license, identification card, club card, etc.), photographs, gift cards, business cards and other paper or laminated cards. Wallets are generally made of leather or fabrics, and they are usually pocket-sized but not always foldable.
The word “wallet” has been in use since the late 14th century to refer to a bag or a knapsack for carrying articles. The word may derive from Proto-Germanic. The ancient Greek word kibisis, said to describe the sack carried by the god Hermes and the sack in which the mythical hero Perseus carried the severed head of the monster Medusa, has been typically translated as "wallet". Usage of the term "wallet" in its modern meaning of "flat case for carrying paper currency" in American English dates to 1834 but this meaning was one of many in the 19th century and early 20th century.
The modern bi-fold wallet with multiple "card slots" became standardized in the early 1950s with the introduction of the first credit cards. Some innovations include the introduction of the Velcro-closure wallet in the 1970s. Pocket-sized wallets remain extremely popular to this day.