sUSD, or Synth USD, is a decentralised stablecoin within the Synthetix ecosystem, a leading protocol for synthetic assets on the Ethereum blockchain. Launched to maintain a stable value pegged to the US dollar, sUSD provides users with the benefits of cryptocurrency—like decentralisation and global accessibility—while mitigating the volatility typically associated with digital assets. It is achieved through smart contracts and a system of collateralisation involving Synthetix Network Tokens (SNX). sUSD plays a crucial role in enabling seamless trading of synthetic assets on Synthetix, allowing users to gain exposure to a wide range of assets without holding the underlying asset. Its stable value facilitates numerous financial activities within the DeFi space, spanning from lending and borrowing to trading derivatives, marking it as a pivotal component of the growing DeFi ecosystem.