This article explores the phenomenon of stablecoins in the cryptocurrency market, highlighting their role in reducing volatility risks. It offers a comprehensive overview of major stablecoins—including USDT, USDC, BUSD, DAI, TUSD, USDG, UST, USDe, PYUSD, and FDUSD—examining their pegging mechanisms, regulatory audits, and market performance. The article delves into stablecoins' applications in DeFi and their function as a safeguard against crypto market fluctuations. Emphasizing the pivotal role of stablecoins in the crypto economy, it advises investors to thoroughly understand their operational mechanisms before investing to ensure financial security.