The piggy bank can be classified in various ways, and the following are several common classification methods:

Material classification: The materials of money storage tanks are usually ceramic, plastic, metal, etc. Different materials of money storage tanks have different characteristics and service life.

Shape classification: The shapes of money storage tanks are usually animals, characters, cartoon characters, etc. Different shapes of money storage tanks can meet people's different preferences and needs.

Function classification: Some piggy banks also have multiple functions, such as an alarm clock, LED display screen, voice storage, etc., which can meet the different needs of users.

Color classification: The piggy bank usually uses rich and colorful colors, which can be classified according to color to meet people's different aesthetic needs.

Capacity classification: The capacity of a piggy bank usually ranges from tens of milliliters to thousands of milliliters, and can be classified according to its capacity to meet people's different storage needs.

Overall, there are various ways to classify money banks, and people can choose a suitable one based on their needs and preferences.