A stablecoin is a cryptocurrency token that’s value is pegged to a fiat currency and maintains a stable value relative to the currency is is pegged to. USDC and USDT are stablecoins pegged to the US dollar and maintains a value equal to $1.
https://www.coinbase.com/learn/crypto-basics/what-is-a-stablecoin
https://www.investopedia.com/terms/s/stablecoin.asp