I have answered this question before,

Gold and silver are naturally not currencies, but currency is naturally gold and silver. "When it comes to precious metal currencies, it refers not only to gold and silver, but also to palladium, platinum, etc. Because they are rare and easy to be divided and stored, humans have fixed them as general equivalents since the end of primitive society, and this continues to this day. Although using precious metals as currency has many advantages, human society is constantly developing, and all tools created by humans are to bring more convenience and help to human life. After my country’s feudal society, due to national politics. With the advancement and improvement of economy, culture, etc., people found that as currency, it was heavy, difficult to carry, and inconvenient to circulate. By the 1930s, precious metal currency gradually withdrew from the field of commodity circulation and entered the field of currency storage and collection. .

\\\Gold and silver are naturally not currencies\\\

Gold and silver were originally ordinary commodities with use value and value, and served as equivalents and general items in barter exchanges. Equivalents finally obtained the exclusive right to serve as general equivalents due to their characteristics.

\\\Currency is naturally gold and silver\\\

Gold and silver themselves are also commodities containing a certain value. , it has natural properties such as small size but high value, uniform texture, easy to divide, not easy to rot, easy to store, easy to collect and carry, etc., so it is easy to perform the functions of currency.

The poster should be able to understand it. College is not so hard.