Fiat money is a currency without intrinsic value established as money by government regulation or law.

You can read more about fiat money on Investopedia.

Examples of fiat currencies are:

On Kraken, we currently refer to Fiat currencies as "Cash" as it's a more commonly understood term.

Fiat currencies can be deposited to or withdrawn from your Kraken account via bank transfers from a number of countries around the world.