Sei is an innovative blockchain platform designed to bring efficiency and speed to decentralised finance (DeFi) applications by offering a specialized infrastructure tailored for high-performance trading. It emerges as a layer-1 blockchain, meaning it operates independently with its own network and native currency, simply referred to as Sei. Originating from the vision of optimizing DeFi services, Sei focuses on scalability, low latency, and high throughput, enabling rapid transaction confirmations. It employs a groundbreaking consensus mechanism by marrying Tendermint's Byzantine Fault Tolerance with its own order matching engine, which caters specifically to trading-intensive activities. As a blockchain protocol that priorotises speed and reliability, Sei targets professionals and developers seeking seamless integration with decentralised exchange functionalities, setting the stage for advanced DeFi capabilities.