Some Types of Money

So, I'm learning something about money. Here are a few types of money:

1. Fiat Money. Examples: Banknotes (paper money) and coins.

2. Commodity Money. Examples: Precious metals (e.g., gold), salt, beads, alcohol.

3. Representative Money. Examples: Certificates, paper money, token coins.

4. Fiduciary Money. Examples: Checks, bank drafts.

There are others out there, too. I'm merely familiarizing myself with these terms.