A decentralized crypto exchange (DEX) allows users to trade digital assets directly from their wallets, without intermediaries. Built on blockchain and smart contracts, DEXs prioritize privacy, security, and control. They eliminate the risk of centralized hacks and custody loss. DEX platforms include AMM (Automated Market Maker) or order book models. Key features include wallet integration, liquidity pools, token swaps, and governance mechanisms. While they offer enhanced transparency, they may have limitations like lower liquidity or slower transactions. DEXs play a critical role in the growing decentralized finance (DeFi) ecosystem.