A stable coin is a cryptocurrency that is pegged to another fiat currency. For example, a stablecoin could be pegged to the U.S. dollar. This means that the value of a stablecoin is equivalent to the value of the U.S. dollar. The most popular stable coins are usually backed by reserves of fiat currency and short term government bonds. One of the main issuer of stable coins is Circle, which offer $USDC and $EURC.