ARK is a decentralized blockchain platform that aims to bridge different blockchain networks by enabling communication and transactions between them. It allows users to create their own blockchain projects and easily connect them with other blockchains within the ARK ecosystem. The ARK token is used for transactions, governance, and as a means of incentivizing network security through staking. ARK uses a Delegated Proof of Stake (DPoS) consensus mechanism to achieve fast transaction speeds and scalability.