Sei (SEI) is a cryptocurrency that aims to provide a decentralized and secure platform for transactions and smart contracts. It utilizes blockchain technology to enable fast and low-cost transactions, as well as privacy features to protect user data. Sei is built on a proof-of-stake consensus mechanism, allowing users to earn rewards by staking their coins. The project aims to be scalable, interoperable, and user-friendly, catering to a wide range of use cases in the digital economy.