A more thorough explanation:

Definition: Silver certificates were a form of U.S. paper money that used to be in circulation and could be exchanged for silver. However, they have been replaced by Federal Reserve notes, which cannot be redeemed for silver.

Example: In the past, if you had a silver certificate worth $1, you could take it to a bank and exchange it for an actual silver dollar. This meant that the paper money was backed by a tangible asset, which was silver. However, this is no longer possible with Federal Reserve notes.

Explanation: The example illustrates how silver certificates used to work and how they differed from the current paper money system. Silver certificates were a way for people to hold paper money that was backed by a valuable asset, which was silver. This gave people confidence in the value of their money. However, this system was eventually replaced by Federal Reserve notes, which are not backed by any tangible asset. This means that the value of the paper money is based on the trust people have in the government and the economy.