Uniswap V3 is a decentralized exchange (DEX) protocol using Automated Market Makers (AMMs) with concentrated liquidity. Liquidity providers choose price ranges for their capital, enabling higher capital efficiency and customizable risk profiles. Traders swap tokens via pools; the protocol executes swaps instantly. You interact with Uniswap V3 via smart contracts on Ethereum and other chains. You can add/remove liquidity, swap tokens, or integrate the protocol into your own contracts. The SDK simplifies interactions; the core contracts handle pool mechanics, pricing, and swaps.