What is the meaning of piggy bank?

Piggy bank is the traditional name of a coin accumulation and storage receptacle (picture on the right); it is most often, but not exclusively, used by children.

Piggy banks are typically made of ceramic or porcelain, and serve as a pedagogical device to teach the rudiments of savings to children; money can be easily inserted, but in the traditional type of bank the pig must be broken open for it to be retrieved. Most modern piggy banks, however, have a rubber plug located on the underside; others are made of vinyl and have a removable nose for easy coin access.

Piggy Bank With Gold Coin © Gino Santa Maria - Fotolia.com