A stablecoin is a type of cryptocurrency whose main characteristic is price stability. Unlike common cryptocurrencies like Bitcoin or Ethereum, which are known for their large and rapid price fluctuations (volatility), the value of a stablecoin is pegged to another, more stable asset. Most often, this is a fiat currency, such as the U.S. dollar (USD) or the euro (EUR), with the goal of maintaining a 1:1 ratio. In this way, they combine the advantages of cryptocurrencies—fast, cheap, and global transactions without intermediaries—with the trustworthiness and stability of traditional money.
There are several types of stablecoins, differing in how they maintain their value. The most common are fiat-collateralized stablecoins (e.g., USDT, USDC), where the issuer holds an equivalent amount of the corresponding currency in bank reserves. Next are crypto-collateralized stablecoins (e.g., DAI), which are over-collateralized with more volatile crypto assets to ensure stability. The third category is algorithmic stablecoins, which are not backed by any asset; their value is managed by smart contracts that automatically regulate supply and demand. In practice, stablecoins are most commonly used on cryptocurrency exchanges for trading and as a temporary safe haven from market volatility.